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December 21, 2014

December 21, 2014

Posted by **maxine** on Wednesday, May 13, 2009 at 9:06pm.

How do you find the slope-intercept form of the equation of the line passing through the points P(2,-9) and Q(3,-7)?

- pre-calculus -
**Reiny**, Wednesday, May 13, 2009 at 9:26pmfor the first:

slope = (7+2)/(4+4) = 9/8

then using the point (4,7)

y-7 = (9/8)(x-4)

8y - 56 = 9x - 36

9x - 8y = -20

check: is (-4,-2) on it?

LS = -36 + 16 = -20

= RS

for the second, find the slope in the same way I did in the first problem

use the point (2,-9) and the slope, sub it into

y = mx + b, solve for b

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