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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)
1 answer
The y-intercept of a trend line represents the value of y when x is 0. In this case, the equation of the trend line is given as \( y = -7.2x + 98.9 \).
To interpret the y-intercept, we can substitute \( x = 0 \) into the equation:
\[ y = -7.2(0) + 98.9 \]
This simplifies to:
\[ y = 98.9 \]
Therefore, the average final grade if a student was on social media for 0 hours is 98.9.
