SOLUTION: Amber is signing up for cell phone service. She is trying to decide between Plan A, which costs $54.99 a month with a free phone included, and Plan B, which costs $49.99 a month,

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Question 153449This question is from textbook Algebra For College Students
: Amber is signing up for cell phone service. She is trying to decide between Plan A, which costs $54.99 a month with a free phone included, and Plan B, which costs $49.99 a month, but would require her to buy a phone for $129. Under either plan, Amber does not expect to go over the included number of monthly minutes. After how many months would Plan B be a better deal? This question is from textbook Algebra For College Students

Answer by jojo14344(1512) (Show Source):
You can put this solution on YOUR website!

Let's equate the 2 plans times no. of months "x" for each plan:

------------>
, cross multiply:

Let's try usage of for each plan:
planA:

planB:

IN 25 MONTHS, PLAN A STILL A BETTER CHOICE
Let's try 26 months:
plan A:

plan B:

THERE YOU GO, YOU START SAVINGS IN CHOOSING PLAN B WHEN YOU REACH 26 MONTHS OF USAGE. TRY 36 MONTHS? 48 MONTHS?
Thank you,
Jojo