algebra
posted by rachel .
Write an equation in slopeintercept form of the line that passes through the given points: (1/2,1), (3,5/2).
Also, write an equation in pointslope form of the line that passes through the given points: (6,3), (1,9).
<soo sick of these.. please help!>
thanks!

You can also do them with the formula
(yy1)/(y2y1) = (xx1)/(x2x1)
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) = (x6)/(16)
(y+3) / 12 = (x6) / 7
7y 21 = 12 x 72
y = 12x/7 +51/7