Your cellphone service charges Php 5 for the first three minutes and Php 1 for every minute additional or a fraction thereof. If you are going to call your uncle leaving at Cagayan de Oro City in your...

Your cellphone service charges Php 5 for the first three minutes and Php 1 for every minute additional or a fraction thereof. If you are going to call your uncle leaving at Cagayan de Oro City in your cellphone. How much will you have to pay if you talk a lot and your call lasts for 8 minutes? Write a rule that best describes the problem and draw its graph using any method.