### Home > CCA2 > Chapter 4 > Lesson 4.2.2 > Problem4-88

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?