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Replace x by -x.
f(x) = x + 1, to reflect this across the y-axis you need to reverse all the x values. Essentially, what this means is that, you rewrite f(x) as f(-x) making the function, -x + 1.
In transformations a reflection across the x axis produces a mirror image
The x-axis runs horizontally across the graph and the y-axis runs vertically on it.
same as if they were positive