question is in the pic.Thank you

For a curve to be symmetric about the x-axis, the point (x,y) must lie on the curve if and only if the point (x, - y) lies on the curve. Explain why a curve that is symmetric about the x-axis is not the graph of a function, unless the function is y = 0. A function is a rule that assigns element of the to each element of the If the points (x,y) and (x, - y) lie on a curve, then the curve can only be a function if In order to be a function that is symmetric about the x-axis on the curve must satisfy this condition. Thus, it follows that a curve that is symmetric about the x-axis is not the graph of a function unless the equation of the curve is (Type an equation.)