Posted by Ana on Sunday, September 25, 2011 at 11:50am.
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?

Gr10 Math  bobpursley, Sunday, September 25, 2011 at 12:52pm
cost+ = 50
costA1= 40 + .05(Time300)
Lets find when the costs are the same: set them equal.
50=40+.05(T300)
10*20=T300
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.

Gr10 Math  Ana, Sunday, September 25, 2011 at 1:16pm
We aren't supposed to solve the system so it confused me, but thank you for the answers.
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