Asked by Ana

Charlene is looking into cell phone plans.
Cell plus gives unlimited minutes for $50/month.A1 Cell offers a $40 monthly fee, plus 5¢/min for any time over 300min oer month.

a)Define two variables and write a linear equation to represent the charges for each company.

b)Which plan should Charlene choose if she estimates that she will use her phone 10h per month? 6h per month?

Answers

Answered by bobpursley
cost+ = 50
costA1= 40 + .05(Time-300)

Lets find when the costs are the same: set them equal.

50=40+.05(T-300)

10*20=T-300
T=500 min they are equal. So at 6hrs, 3600 min, the A1 is cheaper, at 10hr (600 min, the cost+ is cheaper).

Your teacher is too easy.
Answered by Ana
We aren't supposed to solve the system so it confused me, but thank you for the answers.
Answered by anonymous
Actually no that will not be the correct answer it should be
C=40+0.05*[(t-300)+(t-300)/2]

since the answer before written by bobpursley will not make since with anyone number below 300 because it will result in a negative number.
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