Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 6 - Systems of Equations and Inequalities - 6-1 Solving Systems by Graphing - Practice and Problem-Solving Exercises - Page 364: 34


a) For the plan to cost the same each month, you have to send or receive 100 text messages. b) For 50 messages, plan A would be better choise.

Work Step by Step

let x be the amount of text messages, y= total money one has to pay According to the problem, we have two equations: Plan one: y=40+0.2x Plan two: y=60 a) 40+0.2x=60 => 0.2x=20=>x=100 b) Plane one: y=40+0.2(50)=>50 Plane two: 60 => Plane one would be better choice because it is cheaper than plan two $10 for 50 messages.
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