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anonymous

  • 5 years ago

would an equation of a line with a slope of 4 and a y-intercept of (o,2) be y=4x+2?

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  1. anonymous
    • 5 years ago
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    yup

  2. anonymous
    • 5 years ago
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    one last question for you, youve been such a big help

  3. anonymous
    • 5 years ago
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    whats the equation of a line with a slope of 3/7 and contains the point (3,8)

  4. anonymous
    • 5 years ago
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    okay back to the line equation y = mx + b given slope so plug it in y = (3/7)x + b now plug in the points 8 = (3/7)3 + b b = 8 - 9/7 = 47/7 so y = (3/7)x + 47/7

  5. anonymous
    • 5 years ago
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    find the equation of a line that contains the points (3,7) and (12, -4)

  6. anonymous
    • 5 years ago
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    lols you said last question try this one, i'll walk you through it what do you have to do first?

  7. anonymous
    • 5 years ago
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    y=mx+b form?

  8. anonymous
    • 5 years ago
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    wait, find the slope first

  9. anonymous
    • 5 years ago
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    which would be -11/9

  10. anonymous
    • 5 years ago
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    yup to both how do you find the slope of two points

  11. anonymous
    • 5 years ago
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    you got it

  12. anonymous
    • 5 years ago
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    now you have the formula y = mx + b and you have the slope and two points, now what?

  13. anonymous
    • 5 years ago
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    so as of right now the equation is y=-11/9x+b. you put in the two points in the equation?

  14. anonymous
    • 5 years ago
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    since both points are on the line you can choose either ONE pick one to put into the equation it doens't matter which one you use, you'll get the same answer

  15. anonymous
    • 5 years ago
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    so i could have 7=(-11/9)(3)+b?

  16. anonymous
    • 5 years ago
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    yup

  17. anonymous
    • 5 years ago
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    and then you solve for b?

  18. anonymous
    • 5 years ago
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    you got it

  19. anonymous
    • 5 years ago
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    can you walk me through solving b one more time?

  20. anonymous
    • 5 years ago
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    sure you have 7=(-11/9)(3)+b multiply the fraction 7 = -11/3 + b add -11/3 on both sides b = 7 + 11/3 add b = 32/3

  21. anonymous
    • 5 years ago
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    when i multiplied the fraction i got -3.66. how did you get 11/3?

  22. anonymous
    • 5 years ago
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    nevermind. thats the fraction of -3.66

  23. anonymous
    • 5 years ago
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    lols you're using a calculator? -3.66 is the same as -11/3 put that into your calculator

  24. anonymous
    • 5 years ago
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    yup

  25. anonymous
    • 5 years ago
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    so final equation should be y=-11/3+32/3?

  26. anonymous
    • 5 years ago
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    you forgot an x y=(-11/3)x+32/3 ^-- here

  27. anonymous
    • 5 years ago
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    okay thank you!

  28. anonymous
    • 5 years ago
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    cheers ^_^

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