Question

Cell Phone Company A charges $20 each month plus $0.03 per text. Cell Phone Company B charges $5 each month plus $0.07 per text.

Write a system of equations to model the situation using c for cost and t for number of texts.
How many texts does a person need to send in a month to make the costs from both companies equal?

Answer 1

c = 20 + .03t
c = 5 + .07t


20 + .03t = 5 + .07t -- subtract .07t from both sides
20 + .03t - .07t = 5 -- subtract 20 from both sides
.03t - .07t = 5 - 20 -- combine like terms
-.04t = - 15 -- divide both sides by -.04
t = -15/-.04
t = 375

To make both companies equal, there would have to be 375 texts sent.

Answer 2

any questions ?

Answer 3

thanks :'D

Answer 4

no problem :)