Question

Jane has a pre-paid cell phone with NextFell. She can't remember the exact costs, but her plan has a monthly fee and a charge for each minute of calling time. In June she used 450 minutes and the cost was $139.50. In July she used 870 minutes and the cost was $244.50. A) Express the monthly cost C as a function of x , the number of minutes of calling time she used.

Answer 1

So in July is C=139.50$
Minutes=450
X=450:139.50$

In June C=$244.50
Minutes=870
X=minute:C