The y-intercept in the equation y=-7.2x+98.9 represents the point where the trend line crosses the y-axis. In this case, if a student was on social media for 0 hours, the x-value would be 0. Plugging in x=0 into the equation:
y=-7.2(0) + 98.9
y= 98.9
Therefore, if a student was on social media for 0 hours, the average final grade would be 98.9.
Using Trend Lines Practice
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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)
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