# Suppose that the graph of a function f is known. Then the graph of y = f( - x) may be obtained by a reflection about the _______ -axis of the graph of the function y = f(x).

Question

Suppose that the graph of a function f is known. Then the graph of y = f( - x) may be obtained by a reflection about the _______ -axis of the graph of the function y = f(x).