cost=30+rate*volume
42=30+ rate*3
62=30+rate*8
use either equation to solve for rate. Your teacher is too easy.
a) above
b) the slope says more data, more cost. y intercept? Zero data cost
A phone company has a monthly data plan where a customer pays flat monthly fee of $30 and then a certain amount of money per gigabyte (GB) of data used on the phone. If a customer uses 3 GB, the monthly cost will be $42. If the customer uses 8 GB, the monthly cost will be $62.
a. Find a linear equation for the monthly cost of the data plan as a function of x, the number of MB used.
b. Interpret the slope and y-intercept of the equation.
c. Use your equation to find the total monthly cost if 10 GB are used.
1 answer
1 answer