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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?