algebra

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Write an equation in slope-intercept form of the line that passes through the given points: (-1/2,-1), (3,5/2).

Also, write an equation in point-slope form of the line that passes through the given points: (6,-3), (-1,9).

<soo sick of these.. please help!>

thanks!

  • algebra -

    You can also do them with the formula

    (y-y1)/(y2-y1) = (x-x1)/(x2-x1)

    So:
    (y+1)/(5/2+1) = (x+1/2)/(3+1/2)
    y+1 = x+1/2
    y = x - 1/2

    and

    (y+3) /(9+3) = (x-6)/(-1-6)
    (y+3) / 12 = (x-6) / -7
    -7y -21 = 12 x -72
    y = -12x/7 +51/7

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