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1-90.

   Think about the coordinate axes in the two-dimensional coordinate plane. What is the equation of the -axis? What is the equation of -axis? Homework Help ✎

What are the -values for all the points on the -axis?
How would you write an equation to describe that?
Make a list of several points on the -axis if you need to.

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