select the correct choice that completes the sentence below. the graph of y = -f(x) is the graph of y = f(x)…

Brief Explanations:

When we have a function $y = f(x)$ and change it to $y=-f(x)$, for every $x$-value, the $y$-value of the new function is the negative of the $y$-value of the original function. This flips the graph over the $x$-axis.

Answer:

The graph of $y = -f(x)$ is the graph of $y = f(x)$ reflected about the x - axis.