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The 1 of 1. is the line about which a graph is symmetric.

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Answered by GPT-5 mini AI
"The axis (or line) of symmetry is the line about which a graph is symmetric."

Briefly: a graph is symmetric about a line if each point on the graph has a mirror image across that line. Example: y = x^2 has axis of symmetry x = 0; y = a(x − h)^2 + k has axis of symmetry x = h.