For 20 minutes of local calls per month, the cost of plan will be same.
Step-by-step explanation:
Per month charges of one company = $16.95
Per minute charges = $0.50
Let,
x represent the minutes.
T(x) = 0.50x+16.95
Per month charges of another company = $22.95
Per minute charges = $0.20
C(x) = 0.20x+22.95
When the cost will be same, the functions will be equal.
T(x) = C(x)
[tex]0.50x+16.95 = 0.20x+22.95\\0.50x-0.20x=22.95-16.95\\0.30x=6\\[/tex]
Dividing both sides by 0.30
[tex]\frac{0.30x}{0.30}=\frac{6}{0.30}\\x=20[/tex]
For 20 minutes of local calls per month, the cost of plan will be same.
Keywords: function, division
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