### Home > AC > Chapter 8 > Lesson 8.1.4 > Problem 8-40

8-40.

Mary says that you can find an *-*intercept by substituting

*, while Michelle says that you need to substitute*

*.*

Who, if anyone, is correct and why?

One way to view this is graphically: the

-intercept lies anywhere along the-axis.Michelle is correct. The

-intercept always has a-coordinate ofbecause it lies on the -axis.Use the correct approach to find the

*x-*intercept of. Substitute

for and then solve for.