# Parallel and Perpendicular Lines

### Example 1

Is line *p* perpendicular to line *r*?

### Example 2

Is line *q* perpendicular to line *r*?

### Example 3

Which of these lines are parallel and which are perpendicular?

### Example 4

What is the measure of ∠*RZQ*?

### Example 5

If the measure of ∠*UYZ* is 19°, what is the measure of ∠*WYP*?

### Example 6

Which lines are parallel? Which lines are perpendicular?

### Example 7

The equation of line *a* is *y* = -⅕*x* – 1. If line *b* is perpendicular to line *a* and intersects line *a* when *x* = 5, what is the equation of *b*?