Question 941279: The phone company Ringular has a monthly cellular plan where a customer pays a flat monthly fee and then a certain amount of money per minute used on the phone. If a customer uses 160 minutes, the monthly cost will be $49. If the customer uses 710 minutes, the monthly cost will be $104.
A) Find an equation in the form y = m x + b, where x is the number of monthly minutes used and y is the total monthly of the Ringular plan.
B) Use your equation to find the total monthly cost if 611 minutes are used.
Answer by TimothyLamb(4379)   (Show Source):
You can put this solution on YOUR website! given these two x,y pairs on the linear equation:
(160, 49)
(710, 104)
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slope = m = dy/dx
m = (104-49)/(710-160)
m = 0.1
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a) the linear equation:
y - 49 = 0.1(x - 160)
y = 0.1x - 16 + 49
y = 0.1x + 33
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b) cost for 611 minutes/month
y = 0.1x + 33
y = 0.1*611 + 33
y = $94.10
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