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anonymous

  • 5 years ago

solve equation by graphing y=-x-8 9x-8y=-21 please someone help me step by step so i can learn to do this on my own

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  1. amistre64
    • 5 years ago
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    do you have graph paper?

  2. anonymous
    • 5 years ago
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    yes

  3. amistre64
    • 5 years ago
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    then establish a horizontal line and call it X; draw a vertical line and call it Y

  4. anonymous
    • 5 years ago
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    did that

  5. amistre64
    • 5 years ago
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    where the 2 lines cross, call it (0,0) and we can then plot other points from that origin.

  6. amistre64
    • 5 years ago
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    get 2 different colored crayons , one for each line that we are going to plot...

  7. anonymous
    • 5 years ago
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    i have numbered graph paper

  8. anonymous
    • 5 years ago
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    k

  9. amistre64
    • 5 years ago
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    numbered what???....... thats just cheating ;) y=-x-8 since this is an equation for a line, we only need 2 points to draw a line with right?

  10. anonymous
    • 5 years ago
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    what, no my graph paper is pre-numbered y,x 10,-10

  11. amistre64
    • 5 years ago
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    back in my day we had to work to get numbers on graph paper lol

  12. anonymous
    • 5 years ago
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    yeah i was doing that way till i found it online and printed a bunch

  13. amistre64
    • 5 years ago
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    online???...... oh well :) So lets plot 2 points for this y=-x-8 equation. What are your 2 favorite numbers for an x ?

  14. anonymous
    • 5 years ago
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    any #'s?

  15. amistre64
    • 5 years ago
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    any number between -10 and 10 would be helpful :)

  16. anonymous
    • 5 years ago
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    5, -3

  17. anonymous
    • 5 years ago
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    he easy form is must include : -name of a drug -history of drug -street name -short +long term effect -how is it ingested -what effects does it have on body -anyother intersting facts amisstro plz help me write an essay

  18. amistre64
    • 5 years ago
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    ok...les start with ....... -3. when x = -3 our equation becomes: y=-x-8 y=-(-3)-8 y = 3-8 y = -5

  19. amistre64
    • 5 years ago
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    i dont do essays very well...srry

  20. amistre64
    • 5 years ago
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    with this bounty of knowledge we have just obtained we can use it to make a point on the graph.

  21. amistre64
    • 5 years ago
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    put your crayon on the x = -3 part of the X axis

  22. anonymous
    • 5 years ago
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    Is Mary still there?

  23. anonymous
    • 5 years ago
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    (-3,-5)

  24. anonymous
    • 5 years ago
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    yeah

  25. anonymous
    • 5 years ago
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    Okay, The drug Lisinopril is used for high blood pressure.

  26. amistre64
    • 5 years ago
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    yes, we put a point at (-3,-5)

  27. amistre64
    • 5 years ago
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    if yall can take this discussion to another post, that would be helpful :)

  28. anonymous
    • 5 years ago
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    yes please

  29. anonymous
    • 5 years ago
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    sure

  30. anonymous
    • 5 years ago
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    write it in paragraphas

  31. amistre64
    • 5 years ago
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    Now we can use x = 5 and see what we get. y=-x-8 y=-(5)-8 y = -13 (5,-13) gonna have to get longer graph paper for that one ;)

  32. anonymous
    • 5 years ago
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    can we go to the english section and help me i posted there

  33. anonymous
    • 5 years ago
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    graphed

  34. amistre64
    • 5 years ago
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    now we use the other equation, in a different color, and graph its line..

  35. anonymous
    • 5 years ago
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    can we go to the english section and help me i posted there

  36. amistre64
    • 5 years ago
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    9x-8y=-21 , the easiest numbers to use are 0 right?

  37. anonymous
    • 5 years ago
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    right

  38. amistre64
    • 5 years ago
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    ok lets use x = 0 and find a value for y. 9(0)-8y=-21 -8y = -21 y = 21/8 (0,21/8)

  39. amistre64
    • 5 years ago
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    21/8 = 2' 5/8

  40. anonymous
    • 5 years ago
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    amistre64 the essay form is must include : -name of a drug -history of drug -street name -short +long term effect -how is it ingested -what effects does it have on body -anyother intersting facts

  41. amistre64
    • 5 years ago
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    when y = 0 x = what? 9x-8(0)=-21 9x = -21 x = -21/9 (-21/9 , 0) -21/9 = -2' 3/9 = -2' 1/3

  42. anonymous
    • 5 years ago
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    can we go to the english section and help me i posted there

  43. amistre64
    • 5 years ago
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    mary: I dont write essays :) please take it to another post.

  44. anonymous
    • 5 years ago
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    hold on i got lost, im really bad at math

  45. amistre64
    • 5 years ago
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    tell me where we got lost :)

  46. anonymous
    • 5 years ago
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    21/8=2 5/8

  47. anonymous
    • 5 years ago
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    what would my point be for that

  48. amistre64
    • 5 years ago
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    (x=0, y= 2' 5/8) that 'mark helps to define the integer from the fraction

  49. amistre64
    • 5 years ago
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    go up 2 and then mark just a liitle above halfway

  50. anonymous
    • 5 years ago
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    so to graph it (0,2'5/8)

  51. amistre64
    • 5 years ago
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    that would pe one point on the graph of a new line equation.... different colors right?

  52. anonymous
    • 5 years ago
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    right

  53. amistre64
    • 5 years ago
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    the second point is on the x aixs because we made y = 0 right?

  54. amistre64
    • 5 years ago
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    (-2' 1/3 , 0) is our other point, not connect these points with a line

  55. amistre64
    • 5 years ago
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    not means now.... typos persist

  56. anonymous
    • 5 years ago
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    on my paper it asks what is the solution of the equation x=? y=?

  57. anonymous
    • 5 years ago
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    sry solution of the system of equations

  58. amistre64
    • 5 years ago
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    where the lines that we graph cross, where they meet up is a single point. It is asking for the point where the 2 lines meet.

  59. anonymous
    • 5 years ago
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    by my graphing they dont

  60. amistre64
    • 5 years ago
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    we started by finding 2 points for the line to travel thru, but the ends never quit, they go on and on and on.... these lines meet at one point, and that point is our solution. Did you extend your lines until they meet at that point? or did you just connect from dot to dot?

  61. anonymous
    • 5 years ago
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    wait i didnt draw the lines all the way thru

  62. anonymous
    • 5 years ago
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    is it (-5,-2)

  63. anonymous
    • 5 years ago
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    (-5,-3)

  64. amistre64
    • 5 years ago
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    Dunno, you graphed it ;) but lets put those numbers in our equations and see how good they are... y=-x-8 -2 = --5-8 -2 = 5-8 -2 = -3 ..... its a false statment, but we know its close :) 9x-8y=-21 9(-5)-8(-2)=-21 -45 + 16 = -21 -29 = -21 .... wanna try that -3 instead?

  65. anonymous
    • 5 years ago
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    need a ruler, using a folded piece of paper

  66. amistre64
    • 5 years ago
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    the solution by graphing is just a technique, after you use it to "see" what is going on for a solution, you will never really use it again unless you need a visual.

  67. anonymous
    • 5 years ago
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    how often are u on here i need a ft tutor

  68. amistre64
    • 5 years ago
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    as long as the library is open and I dont have class :) ....alot ;)

  69. anonymous
    • 5 years ago
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    ok well i go to strayer university i am always on line, and like i said i really really suck at this kind of math so i always need help got to go for now but will be back on later up until about 3am nc time

  70. amistre64
    • 5 years ago
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    nc ...im in florida :) might be here between 9 and 2

  71. anonymous
    • 5 years ago
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    morning i assume?

  72. anonymous
    • 5 years ago
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    same time zone,

  73. amistre64
    • 5 years ago
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    yep, same zone, college library closes at 2am... I should be around here somewhere. Im the guy with all the fans lol

  74. anonymous
    • 5 years ago
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    yes u r we could exchange numbers if you want that way hearing it sometimes makes better sense

  75. amistre64
    • 5 years ago
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    id rather keep it online ;) you can emailme at tony031172@gmail.com if you need to get in touch with me.

  76. anonymous
    • 5 years ago
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    ok great aatinabo@yahoo

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