Question

Martina purchased a prepaid phone card for 45.50$ calls cost 10 cents a minute using this card. The credit, C (in dollars) , left on the card after it is used for x minutes of calls is given by the following function

Answer 1

Credit (C) = $45.50 - 0.10x

Explanation:

Since you are wanting the credit (C) that is the y variable.

The prepaid phone card starts off with a balance of $45.50.

Every minute a call is made $0.10 is deducted (subtracted) from the card.

The unknown number or 'x' represents the number of minutes the calls lasted.