The correct statement to describe a true relationship between any point on \( f(x) \) and \( -f(x) \) is:
If \((x,y)\) is on the graph of \( f(x) \), then \((x,-y)\) is on the graph of \( -f(x) \).
This means that if you have a point \((x,y)\) that lies on the graph of the function \( f(x) \), the corresponding point on the graph of \( -f(x) \) will have the same \( x \)-coordinate but the opposite \( y \)-coordinate (i.e., \( -y \)).