 Perpendicular lines

## Interactive practice questions

Select the single best definition that describes two perpendicular lines.

Two lines that intersect each other at an angle of 90°.

A

Two lines that have only one intersection.

B

Two lines whose product of slopes is equal to $1$1.

C

Two lines that have no intersections.

D

Two lines that intersect each other at an angle of 90°.

A

Two lines that have only one intersection.

B

Two lines whose product of slopes is equal to $1$1.

C

Two lines that have no intersections.

D
Easy
Less than a minute

If two lines are perpendicular, what is the product of their slopes?

Are the lines $y=x+2$y=x+2 and $y=x-2$y=x2 perpendicular?

Are the following lines perpendicular:

$L_1$L1: $y=7x-5$y=7x5

$L_2$L2: $y=-7x+6$y=7x+6

### Outcomes

#### 10D.AG2.05

Solve problems involving the slope, length, and midpoint of a line segment

#### 10D.AG3.02

Verify, using algebraic techniques and analytic geometry, some characteristics of geometric figures