Posted by Ana on .
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,
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,
We aren't supposed to solve the system so it confused me, but thank you for the answers.