### Home > CCA2 > Chapter 4 > Lesson 4.2.2 > Problem 4-88

4-88.

Think about the axis system in the two-dimensional coordinate plane. What is the equation of the *x*-axis? What is the equation of the *y*-axis? Homework Help ✎

What are the *y*-values for all the points on the *x*-axis?

How would you write an equation to describe that?

Make a list of several points on the *x*-axis if you need to.

Similarly, what are the *x*-values of all the points on the vertical axis?