Using Trend Lines Practice

Question

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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)
Remaining Attempts : 3
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Answer 1

The \( y \)-intercept of the trend line equation \( y = -7.2x + 98.9 \) represents the average final grade when the number of hours spent on social media (\( x \)) is 0.

In this case, when \( x = 0 \):

\[ y = -7.2(0) + 98.9 = 98.9 \]

This means that if a student spends 0 hours on social media, the average final grade would be 98.9.