Question

Troy signed up for a new cell phone plan which charges him a fee of $40 per month, plus $0.05 for each text message that he sends.If Troy wants to spend at the most $70 on his cell phone bill this month which inequality below can be used can be used to determine the number of text messages that he can send

Answer 1

He can send 600 messages.
40+0.05x=70
-40+0.05x=70-40
0.05x=30
So divide 30 by 0.05
and you get 600.