Question

Find the slope of the straight line that passes through the given points or state that the slope is undefined. Then indicate if the line through the points rises (left to right), falls (left to right), is horizontal, or is vertical.


1. (7, 4) and (1, 1)



2. (-3, 4) and (2, -1)


3. (-5, 3) and (-5, 2)

Answer 1

1. (7,4), (1,1).
m = (1-4)/(1-7) = -3/-6=3/6=1/2. Rises.

2. (-3,4), (2,-1).
m = (-1-4)/(2-(-3)) = -5/5 = -1. Falls.

3. (-5,3), (-5,2).
m = (2-3)/(-5-(-5)) = -1/0 = Undefined.
Vertical line.