Homework Help: algebra

Posted by rachel on Monday, October 19, 2009 at 2:38pm.

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 - jim, Monday, October 19, 2009 at 4:09pm
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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