If f(x) is an even function, which statement about the graph of f(x) must be true?

Question

If f(x) is an even function, which statement about the graph of f(x) must be true?

It has rotational symmetry about the origin.
It has line symmetry about the line y = x.
It has line symmetry about the y-axis.
It has line symmetry about the x-axis.

Answer 1

If f(x) is an even function, which statement about the graph of f(x) must be true?

The statement that must be true about the graph of f(x) if it is an even function is: It has line symmetry about the y-axis.