SOLUTION: The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes), as shown in the figure below. The remaining cred

Algebra ->  Functions -> SOLUTION: The credit remaining on a phone card (in dollars) is a linear function of the total calling time made with the card (in minutes), as shown in the figure below. The remaining cred      Log On


   

Question 1135729: The credit remaining on a phone card (in dollars) is a linear function of the
total calling time made with the card (in minutes), as shown in the figure below.
The remaining credit after 34 minutes of calls is $14.56, and the remaining
credit after 67 minutes of calls is $9.28.
What is the remaining credit after 77 minutes of calls?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
y, credit remaining
x, number of minutes of calls

Points (34, 14.56) and (67, 9.28)

y-9.28=%28%289.28-14.56%29%2F%2867-34%29%29%28x-67%29
Simplify this.
Use for the question.