tim is choosing between two cell phone plans that same amount of free minutes. Cingular plane charges 39.99 per month with addit
ional minutes costing 0.45. Verizon plan cost 44.99 with minutes at 0.40 . How many additional minutes a, will it take for thw two plans to cost the same
1 answer:
Answer:
100 minutes
Step-by-step explanation:
Let
x ----> the number of minutes
y ----> the total cost of the plan
we know that
<em>Cingular Plan</em>
-----> equation A
<em>Verizon Plan</em>
-----> equation B
To find out how many additional minutes will it take for the two plans to cost the same
Solve the system of equations A and B
Solve by graphing
Remember that the solution is the intersection point both graphs
using a graphing tool
The solution is the point (100,84.99)
see the attached figure
therefore
For x=100 minutes
The cost for both plans is $84.99
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