If a customer uses 310 minutes, the monthly cost will be $180. If the customer uses 630 minutes, the monthly cost will be $340.
A phone company has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses 310 minutes, the monthly cost will be $45.50. If the customer uses 840 minutes, the monthly cost will be $72.
(a) Find a linear equation for y, the monthly cost in dollars, of the cell plan as a function of x, the number of monthly minutes used.
y = b) Interpret the slope and y-intercept of the equation.The __ y-intercept slope is the $___ flat monthly fee, and the ____
y-intercept slope
is the $___ fee for each additional minute used.
(c) Use your equation to find the total monthly cost if 769 minutes are used.