$y=18-5x$

The equation above represents the speed $y$, in feet per second, of Sheila's bicycle $x$ seconds after she applied the brakes at the end of a ride. If the equation is graphed in the $xy$-plane, which of the following is the best interpretation of the $x$-coordinate of the line's $x$-intercept in the context of the problem?

Question

Accepted Answer

The number of seconds it took from the time Sheila began applying the brakes until the bicycle came to a complete stop

Answer

The speed of Sheila's bicycle, in feet per second, before Sheila applied the brakes

Answer

The number of feet per second the speed of Sheila's bicycle decreased each second after Sheila applied the brakes

Answer

The number of feet Sheila's bicycle traveled from the time she began applying the brakes until the bicycle came to a complete stop