Can these get checked.

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 ; rising

2. (-3, 4) and (2, -1)
= -1 ; fall

3. (-5, 3) and (-5, 2)
= 0 undefined ; vertical

slope is y/x, not x/y

1. (1-4)/(1-7) = 1/2, not 2
2. (-1-4)/(2+3) = -1, so you're ok there. lucky, since 1/-1 = -1

3. since both x coordinates are the same, the line is vertical, but that means it is undefined, not 0. It can't be both 0 and undefined, since 0 is defined, and is the slope of horizontal lines.