### Home > AC > Chapter 9 > Lesson 9.3.2 > Problem9-76

9-76.

Multiple Choice: Which equation below is perpendicular to the line y = $\frac { 1 } { 3 } x+7$ ?

1. $x + 3y = 4$

1. $x − 3y = 4$

1. $3x + y = 4$

1. $3x − y = 4$

Solve each equation for y.

The slope of a perpendicular line will be the opposite reciprocal.

The new lines slope should be −3.

(c)