SOLUTION: A 10 minute cab ride costs $7.50. A 15 minute cab ride costs $12.50. Write a linear model to model the situation and use it to predict how much a 30 minute cab ride would cost.

Question 827373: A 10 minute cab ride costs $7.50. A 15 minute cab ride costs $12.50. Write a linear model to model the situation and use it to predict how much a 30 minute cab ride would cost.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A 10 minute cab ride costs $7.50. A 15 minute cab ride costs $12.50. Write a linear model to model the situation and use it to predict how much a 30 minute cab ride would cost.
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You have two points (10,7.50) and (15,12.50)
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slope = (12.5-7.5)/(15-10) = 5/5 = 1
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Form: y = mx + b
7.5 = 1*10 + b
b = -2.5
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Equation:
f(x) = x - 2.5
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f(30) = 30-2.5 = $27.50
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Cheers,
Stan H.
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