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anonymous

  • 5 years ago

Write a linear system that models the situation. The sum of two numbers is 14. Their difference is 10. I got 2+12 = 14. Help? I suck at this...

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  1. anonymous
    • 5 years ago
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    Okay I'm stumped.

  2. anonymous
    • 5 years ago
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    Does the problem call for you to solve it?

  3. anonymous
    • 5 years ago
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    I don't think so. It just says model the situation as a linear equation..

  4. anonymous
    • 5 years ago
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    Maybe it's just x + y = 14

  5. anonymous
    • 5 years ago
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    As a linear "system"?

  6. anonymous
    • 5 years ago
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    Yes.

  7. anonymous
    • 5 years ago
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    A system of equations has more than one equation.

  8. anonymous
    • 5 years ago
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    That's why I don't understand this...It's weird.

  9. anonymous
    • 5 years ago
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    The term linear refers to the variables having no exponents. So, it's asking you to write those two equations using x and y

  10. anonymous
    • 5 years ago
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    Don't you mean no coefficients?

  11. anonymous
    • 5 years ago
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    Your first answer, X + Y = 14 is correct. You need to turn the Something minus something = 10 into a equation

  12. anonymous
    • 5 years ago
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    Oh.

  13. anonymous
    • 5 years ago
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    Uh x -y = 10

  14. anonymous
    • 5 years ago
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    Bam. That's it! X + Y = 14 X - Y = 10

  15. anonymous
    • 5 years ago
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    Wow...

  16. anonymous
    • 5 years ago
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    And yup, a linear equation has no exponents. All of it's variables are to the first power.

  17. anonymous
    • 5 years ago
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    Damn I'm stupid

  18. anonymous
    • 5 years ago
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    I always think the problem is going to be hard, but it's hella easy.

  19. anonymous
    • 5 years ago
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    Thank You once...again.

  20. anonymous
    • 5 years ago
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    You're welcome. Also, Don't ever call yourself stupid, because you're not. Don't sell yourself short. If you keep telling yourself your stupid, you'll eventually believe it.

  21. anonymous
    • 5 years ago
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    I'm stupid on this one question.

  22. anonymous
    • 5 years ago
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    :P

  23. anonymous
    • 5 years ago
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    Okay now I'm stuck again.

  24. anonymous
    • 5 years ago
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    What is an equation for one CD costing $2 more than the other? Do you know? >-<

  25. anonymous
    • 5 years ago
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    Well, the first step is to assign variables, right?

  26. anonymous
    • 5 years ago
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    You told me CDA = CD2 + $2, right?

  27. anonymous
    • 5 years ago
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    Well both of the two Cds equal $28

  28. anonymous
    • 5 years ago
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    We can use mathematics to describe relationships between things

  29. anonymous
    • 5 years ago
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    Yes.

  30. anonymous
    • 5 years ago
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    What's the whole question?

  31. anonymous
    • 5 years ago
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    You buy two CDs for a total of $28. One CD cost $2 more than the other.

  32. anonymous
    • 5 years ago
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    -_- XC Bahh. I can't answer it.

  33. anonymous
    • 5 years ago
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    ? Sure you can.

  34. anonymous
    • 5 years ago
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    It's asking you to write another system of equations, right?

  35. anonymous
    • 5 years ago
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    Yeah.

  36. anonymous
    • 5 years ago
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    First off, what's in a system of equations? What is it? And why do we use it?

  37. anonymous
    • 5 years ago
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    We try to find the values of the unknown?

  38. anonymous
    • 5 years ago
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    A system of equations is a list of equations. It has several equations, usually with more than one variable

  39. anonymous
    • 5 years ago
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    Are you still here?

  40. anonymous
    • 5 years ago
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    Yes.

  41. anonymous
    • 5 years ago
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    Okay. We use a system of equations to help solve for more than one variable.

  42. anonymous
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    Okay.

  43. anonymous
    • 5 years ago
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    With one equation, X + Y = 12, it's impossible to find what X and Y are. Can you tell me why?

  44. anonymous
    • 5 years ago
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    Please tell me why. ^^

  45. anonymous
    • 5 years ago
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    Because we need a real number. You can't just solve it with variables?

  46. anonymous
    • 5 years ago
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    Nope. Try graphing it

  47. anonymous
    • 5 years ago
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    You can't.

  48. anonymous
    • 5 years ago
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    unless you make up the numbers..

  49. anonymous
    • 5 years ago
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    Variables exist within an equation, so we can put numbers in.

  50. anonymous
    • 5 years ago
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    I think what you mean, is that there is an infinite amount of solutions, right?

  51. anonymous
    • 5 years ago
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    Yeah..pretty much.

  52. anonymous
    • 5 years ago
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    In the equation (X+Y = 12), if X = 3, than Y = 9, if X is 10, than Y is 2, and so on

  53. anonymous
    • 5 years ago
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    You can graph these points, and it makes a straight line. The straight line represents all of the answers that work in the equation.

  54. anonymous
    • 5 years ago
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    Okay. Are you telling me then I can find the slope...? rise/run right?

  55. anonymous
    • 5 years ago
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    The slope is a tool. It helps us graph the line, and it tells us how quickly it goes up or down. I'm explaining this to you, because I don't think you completely grasp graphing, or equations yet.

  56. anonymous
    • 5 years ago
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    I know how to graph equations.

  57. anonymous
    • 5 years ago
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    I usually use y=mx + b

  58. anonymous
    • 5 years ago
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    I then graph it from there, or there are other forms I can graph from like standard form or point-slope form.

  59. anonymous
    • 5 years ago
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    I undestand that you can graph. But do you understand why you graph?

  60. anonymous
    • 5 years ago
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    Why do we graph?

  61. anonymous
    • 5 years ago
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    We graph for a couple of reasons.

  62. anonymous
    • 5 years ago
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    First off, pictures are easier to understand than really complicated formulas

  63. anonymous
    • 5 years ago
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    True,

  64. anonymous
    • 5 years ago
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    Next, with a graph, we can solve equations that we don't know the answer of

  65. anonymous
    • 5 years ago
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    Equations? That's only useful for math! But, remember what I said? We use math to describe how things are related

  66. anonymous
    • 5 years ago
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    I'm going to give you two equations, and I want you to graph them, okay? When you graph them, you should be able to get the answer without doing any algebra.

  67. anonymous
    • 5 years ago
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    You need to just plug in a few points, and then plot them.

  68. anonymous
    • 5 years ago
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    X + Y = 12, and X - Y = 5

  69. anonymous
    • 5 years ago
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    Graph them on the same graph.

  70. anonymous
    • 5 years ago
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    (If that makes any sense :) )

  71. anonymous
    • 5 years ago
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    Yeah it does. You can solve linear systems by substitution or graphing or elimination..

  72. anonymous
    • 5 years ago
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    Yup.

  73. anonymous
    • 5 years ago
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    Okay it's 2:08am. It's not hat I want to not learn, but I need to goto sleep now. Thanks for the lecture.

  74. anonymous
    • 5 years ago
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    If you graph the two lines, they should intersect at only one point. That's the only answer that's correct.

  75. anonymous
    • 5 years ago
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    :D

  76. anonymous
    • 5 years ago
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    For your question, you need to write a system of equations.

  77. anonymous
    • 5 years ago
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    Yeah they intersect, but I still think substitution is the easiest way out of all the methods I've learned.

  78. anonymous
    • 5 years ago
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    It's the fastest. With the more complicated math, you'll suddenly love graphing

  79. anonymous
    • 5 years ago
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    What itf you can't draw lines that well?

  80. anonymous
    • 5 years ago
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    Erm, substitution is. And, the lines don't have to be perect.Anyway, You buy two CDs for a total of $28. One CD cost $2 more than the other.

  81. anonymous
    • 5 years ago
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    also I know I have to write linear systems but I only think I have to write two.

  82. anonymous
    • 5 years ago
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    x + y = 28 I know that's one.

  83. anonymous
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    I think the other is 2 - y ...

  84. anonymous
    • 5 years ago
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    One CD + 2 = another CD, right?

  85. anonymous
    • 5 years ago
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    Just substitute the variables

  86. anonymous
    • 5 years ago
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    No the total cost of the two equals 28 dollars.

  87. anonymous
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    I don't need to solve it..

  88. anonymous
    • 5 years ago
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    Yeah. But the 2nd clause says that one cd costs two more dollars than the other

  89. anonymous
    • 5 years ago
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    That's an equation.

  90. anonymous
    • 5 years ago
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    Oh I wrote an expression..

  91. anonymous
    • 5 years ago
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    Oh I wrote an expression..

  92. anonymous
    • 5 years ago
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    Oh I wrote an expression..

  93. anonymous
    • 5 years ago
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    ?

  94. anonymous
    • 5 years ago
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    X + 2 = Y. Truthfully, it doesn't matter what variable +2 = the other variable.

  95. anonymous
    • 5 years ago
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    Must be a glitch

  96. anonymous
    • 5 years ago
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    Anyway, I'm sorry I wasn't the most helpful for the equation. God bless with your mathematic endeavors, and good night.

  97. anonymous
    • 5 years ago
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    Okay

  98. anonymous
    • 5 years ago
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    Ashag, are you still here? If so, go to your latest problem, and I"ll take a crack at it

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