Parallel and Perpendicular Lines and Their Slopes

Front

What do we call lines that cross?

Back

Intersecting

Front

What do we call lines that intersect and form 90 degree angles?

Back

Perpendicular

Front

Slopes of parallel lines are...

Back

the same.

Front

Slopes of perpendicular lines are...

Back

opposite reciprocals.

Front

y = -2/3x + 2
y = 3/2x + 9
These lines are...

Back

Perpendicular

Front

What slope is perpendicular to: m = 5/8

Back

-8/5

Front

y = 6x + 2
y = -6x + 2
These lines are...

Back

Neither

Front

Line 1: (15, 20), (17, 18)
Line 2: (-22, -18), (-20, -16)

The two lines are: Parallel, Perpendicular, Neither

Back

Perpendicular

Front

y = 3x + 2
y = 3x - 3
These lines are...

Back

Parallel

Front

Back