Answer: For a curve to be symmetric about the x-axis, the
Chapter 1, Problem 1.1 69(choose chapter or problem)
For a curve to be symmetric about the x-axis, the point (x, y) must lie on the curve if and only if the point (x, -y) lies on the curve. Explain why a curve that is symmetric about the x-axis is not the graph of a function, unless the function is y=0.
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