Parallel & Perpendicular Lines Review Warm-Up

Front

What must be true to prove lines are parallel using the slope?

Back

The slopes are equal.

Front

Back

Front

Which of the following pairs of lines are parallel? y = 2x + 3 and y = 2x - 1

Back

These lines are parallel.

Front

What are the slopes of perpendicular lines?

Back

Slopes of perpendicular lines are opposite reciprocals.

Front

Are the lines y = -\frac{2}{3}x + 2 and y = \frac{3}{2}x + 9 parallel, perpendicular, or neither?

Back

These lines are perpendicular.

Front

Define parallel lines in terms of slope.

Back

Parallel lines have equal slopes.

Front

Define perpendicular lines in terms of slope.

Back

Perpendicular lines have slopes that are opposite reciprocals.

Front

If the slope of one line is 2, what is the slope of a line perpendicular to it?

Back

The slope of the perpendicular line is -\frac{1}{2}.

Front

What is the slope of the line represented by the equation y = 5x + 4?

Back

The slope is 5.

Front

If two lines have slopes of 3 and -\frac{1}{3}, are they parallel, perpendicular, or neither?

Back

They are perpendicular.