A wireless phone plan costs Eric $35 for a month of service during which he sent 450 text messages. If he was charged an fixed a fee of $12.50, how much did he pay per text?

5 cents

Step-by-step explanation:

Let m = cost per message

450m + 12.5 = 35 subtract 12.5 from both sides

450m = 35-12.5

450m = 22.5 divide both sides by 450

m = 22.5/450

m =.05

The cost is $.05 per message ... 5 cents