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Home > CCA > Chapter 8 > Lesson 8.1.4 > Problem 8-42


Mary says that you can find an -intercept by substituting for , while Michelle says that you need to substitute for .  

  1. 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 of because it lies on the -axis.

  2. Use the correct approach to find the -intercept of .

    Substitute for and then solve for .