algebra

write an equation in point slope form for the line with the given slope that contains the given point..
slope=5;(1,7) is on the line

(8,-2) and (4,-4) are on the line

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asked by genny
  1. y=mx+b=5x+b

    put in the x,y point, solve for b.
    7=5*1+b
    b=2

    y=5x+2

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  2. (8,-2) and (4,-4) are on the line

    Find slope: m = y2 - y1/x2 - x1

    -4 - (-2)/4 - 8 = -2/-4 = 1/2

    m = 1/2

    Use either point to find y-intercept.

    y = mx + b

    -4 = 1/2(4) + b
    -4 = 2 + b
    -4 - 2 = 2 - 2 + b
    -6 = b

    y = 1/2x - 6

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    posted by Chelle

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