SOLUTION: Please could you explain what it means reflect the graph in the y-axis

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Question 194841: Please could you explain what it means reflect the graph in the y-axis
Answer by Mathtut(3670) About Me  (Show Source):
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Every point that was to the right of the origin gets reflected to the left. And every point that was on the left gets reflected to the right. Every x becomes −x. Only the y-intercept is invariant. The equation of the reflection of f(x) about the y-axis is y = f(−x).