Question

Inez has a phone card. The graph shows the number of minutes that remain on her phone card after a certain number of days.

The slope of the line that represents the data is –50, and the y-intercept is 850. What do the slope and y-intercept represent in Inez’s situation?

The y-intercept indicates that the phone card started with 850 minutes. The slope indicates that 50 minutes were used per day.

The y-intercept indicates that the phone card started with 50 minutes. The slope indicates that 850 minutes were used per day.

The slope indicates that the phone card started with 850 minutes. The y-intercept indicates that 50 minutes were added per day.

The slope indicates that the phone card started with 50 minutes. The y-intercept indicates that 850 minutes were added per day.

Answer 1

The y-intercept indicates that the phone card started with 850 minutes. The slope indicates that 50 minutes were used per day.

Explanation:

The graph cuts the y-axis at 850.This indicates that the phone card started with 850 minutes before it was used.

The slope of the graph is -50.This means that in every increase of one in the input variable (number of days), you get a decrease of 50 in the output variable (number of minutes remaining). This indicates every day, 50 minutes were used, hence 50 minutes reduced from the card per day.

Answer 2

The answer is A. The y-intercept indicates that the phone card started with 850 minutes. The slope indicates that 50 minutes were used per day.

This is because she started with 850 and the graph shows a decrease, so this means that she loses 50 per day or that she uses 50 per day.