Question

Match the types of graphs with a slope which fits its characteristics.

Parallel lines
Perpendincular lines
Horizontal lines
Vertical lines

both slopes are 1
one slope is 5 and one slope is -1/5
both slopes are 5
both slopes are undefined

Answer 1

Parallel lines have equal slopes.
If you multiply the slopes of perpendicular lines, you get -1
Horizontal lines have slope 0 because they have no rise.
Vertical lines have slopes that are undefined because their run is 0 and dividing by 0 is undefined.

Answer 2

Now. Can you match them up?