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lolly

  • 3 years ago

What is an equation for the line that passes through points (–1, –4) and (1, 4)? Write the equation in slope-intercept form. (2 points)

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  1. surdawi
    • 3 years ago
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    y = mx + b m=(y2-y1)/(x2-x1)

  2. surdawi
    • 3 years ago
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    @lolly wanna try

  3. lolly
    • 3 years ago
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    no..but i will..:)

  4. Swageraid32
    • 3 years ago
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    (1,-4), m = -4 y = mx + b Sub to find b -4 = -4*1 + b b = 0 ------- y = -4x m = -4 means slope = -4. slope-intercept form of equation of a straight line is y = mx + b. m is the slope. b is the y-intercept. your equation starts of with the slope-intercept generic form of y = mx + b replace m with -4 to get y = -4x + b your line goes through the point (x,y) = (1,-4) that means the x-coordinate is 1 and the y coordinate is -4. to find the y-intercept, you replace y with -4 and x with 1 in the equation and solve for b. your equation of y = -4x + b becomes: -4 = (-4 * 1) + b

  5. lolly
    • 3 years ago
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    can you set up the equation? then ill solve:P

  6. surdawi
    • 3 years ago
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    @swiftskier96 is that the answer http://www.algebra.com/algebra/homework/Graphs/Graphs.faq.question.233716.html hahaha

  7. surdawi
    • 3 years ago
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    (x1,y1) = (–1, –4) (x2,y2) = (1, 4)

  8. lolly
    • 3 years ago
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    soo y=mx=b? isnt that for finding slope?

  9. surdawi
    • 3 years ago
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    yes but you need to find m 1st \[y=\frac{ y2-y1 }{ x2-x1 }\]

  10. surdawi
    • 3 years ago
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    meant m =

  11. lolly
    • 3 years ago
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    ook ill try it..hold on..:)

  12. lolly
    • 3 years ago
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    m=-6

  13. lolly
    • 3 years ago
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    now what?

  14. surdawi
    • 3 years ago
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    show me how?

  15. surdawi
    • 3 years ago
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    m is wrong :D

  16. lolly
    • 3 years ago
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    really?

  17. lolly
    • 3 years ago
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    m= 1-4/-1--4. m=-3/3 m=-6

  18. surdawi
    • 3 years ago
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    (x1,y1) = (–1, –4) (x2,y2) = (1, 4) x1 = -1 y1 = -4 x2 = 1 y2 = 4

  19. chrispearson813
    • 3 years ago
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    hi lolly :P

  20. lolly
    • 3 years ago
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    right..thats what i did..,.i think..?

  21. lolly
    • 3 years ago
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    hi..:)

  22. 03225186213
    • 3 years ago
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    (y-y1)/(y2-y1)=(x-x1)/(x2-x1)

  23. lolly
    • 3 years ago
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    @surdawi how did i do it rong?

  24. surdawi
    • 3 years ago
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    (4- - 4)/(1- -1)= 8/2=4

  25. lolly
    • 3 years ago
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    so m is 4?

  26. surdawi
    • 3 years ago
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    what you did (x2-y2)/(x1-y1)

  27. lolly
    • 3 years ago
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    well i thought it was -6..but its not..?

  28. surdawi
    • 3 years ago
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    m = 4 now you choose wither point and solve for b y = 4x + b

  29. lolly
    • 3 years ago
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    k hold on ill try again..:)

  30. surdawi
    • 3 years ago
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    \[m=\frac{ y2-y1 }{ x2-x1 }=\frac{ 4- -4 }{ 1- -1 }=\frac{ 8 }{ 2 }=\]

  31. 03225186213
    • 3 years ago
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    for slope slope=(y2-y1)/(x2-x1) it can be directly solve see the formula that i have given already

  32. 03225186213
    • 3 years ago
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    (y-y1)/(y2-y1)=(x-x1)/(x2-x1)

  33. lolly
    • 3 years ago
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    oooh!!! i got the x1and 2s switched up..ok i see..:)

  34. surdawi
    • 3 years ago
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    |dw:1351797990809:dw|

  35. lolly
    • 3 years ago
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    the one with less numbers right?

  36. surdawi
    • 3 years ago
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    there is no zeros for x or y this time so pick one and solve, it doesnt matter which one

  37. lolly
    • 3 years ago
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    which one would be easier?

  38. surdawi
    • 3 years ago
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    either, same thing

  39. lolly
    • 3 years ago
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    k ill do the one with less numbers..:P

  40. lolly
    • 3 years ago
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    so 4=4x1=b? 4=b..but we already knew that..

  41. surdawi
    • 3 years ago
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    both of them has same amount of numbers :p 4=4x1=b? ! why is there an equal to b

  42. lolly
    • 3 years ago
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    oooh! whoop..my bad..:)

  43. lolly
    • 3 years ago
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    so 4=4+4...

  44. lolly
    • 3 years ago
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    4=8? that dosent make sense...

  45. surdawi
    • 3 years ago
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    4=4x1+ b what is x1 = ?

  46. lolly
    • 3 years ago
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    -1

  47. surdawi
    • 3 years ago
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    y1 =?

  48. lolly
    • 3 years ago
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    -1

  49. lolly
    • 3 years ago
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    000h!!!

  50. lolly
    • 3 years ago
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    no it dosent..:)

  51. lolly
    • 3 years ago
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    -4

  52. surdawi
    • 3 years ago
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    it should be one of the pairs either (1,4) or (-1,-4) -4 = 4*(-1) + b

  53. lolly
    • 3 years ago
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    -4=4x-1=4?

  54. surdawi
    • 3 years ago
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    4*-1=?

  55. lolly
    • 3 years ago
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    -4

  56. surdawi
    • 3 years ago
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    -4 = -4 + b how can you keep b on one side?

  57. lolly
    • 3 years ago
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    by adding 4 to b?

  58. surdawi
    • 3 years ago
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    ok show me how?

  59. lolly
    • 3 years ago
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    -4=-4+b (then the 4 crosses out) +4 +4

  60. surdawi
    • 3 years ago
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    -4 +4 = -4 + 4 +b 0 = b y = 4x + 0

  61. lolly
    • 3 years ago
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    where did the other set of -4=4 come from?

  62. surdawi
    • 3 years ago
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    you have to add 4 to both sides

  63. surdawi
    • 3 years ago
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    passes through points (–1, –4) and (1, 4)?

  64. surdawi
    • 3 years ago
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    Anamaria what grade you in?

  65. lolly
    • 3 years ago
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    10.:)

  66. surdawi
    • 3 years ago
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    you should know how to add :P

  67. lolly
    • 3 years ago
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    lol i do know how to add:)

  68. lolly
    • 3 years ago
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    -4=-4+b (then the 4 crosses out) +4 +4 was this rong?

  69. lolly
    • 3 years ago
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    lol @surdawi u sleeping?

  70. surdawi
    • 3 years ago
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    i went to pray |dw:1351801108941:dw|

  71. lolly
    • 3 years ago
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    lol were u praying that id understand how to do this? lol jk ook umm anyway i thought b=4?

  72. surdawi
    • 3 years ago
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    lol muslims pray 5 times a day not only sundays :P ok plug in b = 4 to check y = 4*x + 4 (1, 4) 4 = 4*1 + 4 4 = 8? is that right

  73. lolly
    • 3 years ago
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    4 is not 8...? im so confused!!

  74. surdawi
    • 3 years ago
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    thats would be the answer if b was 4 correct answer is y = 4x + 0 = 4x plug in and check and where is my medal at??

  75. surdawi
    • 3 years ago
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    do you want me to give you problem to do?

  76. surdawi
    • 3 years ago
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    try solving this What is an equation for the line that passes through points (2,5) and (6,7)? Write the equation in slope-intercept form. (you pay $10 hehe)

  77. lolly
    • 3 years ago
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    noo i dont want another problem im too stuck with this one..:)

  78. surdawi
    • 3 years ago
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    tell what you dont understand |dw:1351802673845:dw|

  79. lolly
    • 3 years ago
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    i dont really understand what you did..like at all... for the one on the right side...

  80. surdawi
    • 3 years ago
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    ok (-1,-4) now we need to substitute that into y =mx + b y = -4 x = -1 m = 4 y = m* x + b -4 = 4*(-1) + b -4 = -4 + b we now need to add a 4 to both sides -4 = -4 + b +4 +4 -------------- 0 = 0 + b ===> b = 0

  81. lolly
    • 3 years ago
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    ok so b = 4 and 0?

  82. surdawi
    • 3 years ago
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    no only 0 how do you get the 4?

  83. lolly
    • 3 years ago
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    what we did earlier..

  84. surdawi
    • 3 years ago
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    we never got b = 4 we got m is 4

  85. lolly
    • 3 years ago
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    oooh!!!

  86. surdawi
    • 3 years ago
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    i have to go to my Advance Engineering Math :( right now; which doesnt look like anything on here...try to figure it out; if you still have problems feel free to message me the answer is y = 4x

  87. lolly
    • 3 years ago
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    k thanks 4 ur help:)

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