### Home > AC > Chapter 11 > Lesson 11.1.2 > Problem 11-23

11-23.

Marley thinks that the two lines below are perpendicular, but Bob thinks they are not. Who is correct and how do you know? Homework Help ✎

2*x* − 7*y* = 16

7*x* + 2*y* = 3

Rearrange the equations into slope intercept form. If the slopes

are opposite reciprocals of each other then the lines are perpendicular.