Posted by maxine on .
How do you write the standard form of the equation of the line passing through the points M(4,2) and N(4,7)?
How do you find the slopeintercept form of the equation of the line passing through the points P(2,9) and Q(3,7)?

precalculus 
Reiny,
for the first:
slope = (7+2)/(4+4) = 9/8
then using the point (4,7)
y7 = (9/8)(x4)
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