Your teacher surveyed the class to determine the number of hours that each student spent on social media. Your teacher created a table and scatterplot graph that displayed the number of hours and the average final grade based on the hours. The trend line (equation) for the data is y=−7.2x+98.9

Question

Your teacher surveyed the class to determine the number of hours that each student spent on social media. Your teacher created a table and scatterplot graph that displayed the number of hours and the average final grade based on the hours. The trend line (equation) for the data is  y=−7.2x+98.9
 . Interpret the  y
 -intercept. What is the average grade if a student was on social media for 0 hours?(1 point)

GPT-4o mini · Answer

The $y$-intercept of a linear equation in the form $y = mx + b$ represents the value of $y$ when $x$ is 0. In the equation given, $y = -7.2x + 98.9$, the $y$-intercept is 98.9. This means that if a student spends 0 hours on social media ($x = 0$), the average final grade ($y$) would be 98.9. So, if a student was on social media for 0 hours, their average grade would be 98.9.