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?

Answer 1

In the equation y=◂+▸−7.2x+98.9, the y-intercept refers to the value of y when x (the number of hours on social media) is equal to 0.

Therefore, if a student was on social media for 0 hours (x=0), the equation simplifies to y=▸+98.9.

The y-intercept of 98.9 represents the average grade of a student who did not spend any time on social media.