The y-intercept of the trend line, which has the equation y = −7.2x + 98.9, represents the average grade when a student spends 0 hours on social media.
In this case, when a student spends 0 hours on social media (x = 0), the equation becomes y = −7.2(0) + 98.9, which simplifies to y = 98.9.
Therefore, the interpretation of the y-intercept is that the average grade for a student who did not spend any time on social media is 98.9.
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)
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