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sistersaray
29.06.2019 •
Mathematics
One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and slice an equation to find the number of minutes you must talk to have the same cost for both calling plans.
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Ответ:
300 minutes
Step-by-step explanation:
Let
x> the numbers of minutes used
y ---> the cost per month
we know that
First cell phone plan
y=0.15x+20 ---> equation A
Second cell phone plan
y=0.10x+35 ---> equation B
equate the equation A and equation B
0.15x+20=0.10x+35
Solve for x
0.15x-0.10x=35-20
0.05x=15
x=15/0.05
x= 300 minutes
Find the cost y
y=0.15(300)+20 =$65
That means
For x=300 minutes
The cost for both calling plans is y=$65
Ответ:
So, the degree of the polynomial 2x - 3 = 1.