Question

A graph of the function y = 80x + 2 models Carli's road trip, with her speed measured in miles per hour. The graph includes the two hours of stops she'll make. Using this information, define which quantity describes the x-axis.

Answer Options:

speed traveled
miles traveled
time in hours
direction traveled

Answer 1

In the context of the given function \( y = 80x + 2 \), where \( y \) represents Carli's speed in miles per hour and \( x \) represents the time in hours, the x-axis represents the independent variable, which in this case is the time that has passed during her road trip.

Therefore, the quantity that describes the x-axis is:

**time in hours**.