SOLUTION: What is the test of symmetry about the x-axis? Explain the logic behind this test (why does it "make sense")?

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Question 1045170: What is the test of symmetry about the x-axis? Explain the logic behind this test (why does it "make sense")?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
Points are same distance away but on the opposite side of the axis.