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(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.

- 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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