Which best describes the graph of the function f (x) = - 5x?

This is a simple slope intercept form equation: y=ax+b

Where a is the slope and b is the y-intercept, but in this problem the y-intercept is 0 so it is no shown.

The line on the graph would be negative (downward) because of the negative and would be going down by a slope of - 5.

-down 5 over 1 (rise over run)