### 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)