Linear Functions from Situations Quick Check

Question

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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.(1 point)
Responses

miles traveled
miles traveled

speed traveled
speed traveled

direction traveled
direction traveled

time in hours
time in hours
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Answer 1

In the given function \( y = 80x + 2 \), where \( y \) represents Carli’s speed in miles per hour and \( x \) is a variable representing another quantity, the appropriate choice for the x-axis would be time in hours.

This is because the function represents Carli's speed at different points in time, and typically in such functions, time is used as the independent variable (x-axis).