Exercise 32 Page 66

a The total cost of renting a car from Proxy,

C_{P}

, is the sum of a surcharge and a variable cost. We can rewrite this as an equation.

C_{P} = surcharge + variable cost

Since we know that the

surcharge

is equal to

$ 18,

we can substitute

18

into our equation.

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b Similary, the total cost of renting a car from YourPal,

C_{Y}

, is also the sum of a surcharge and a variable cost. We can rewrite it as an equation.

C_{Y} = surcharge + variable cost

Since we know that the

surcharge

is equal to

$ 12,

we can substitute

12

into our equation.

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c Now that we have functions for the total cost of renting a car from each company, we will calculate the cost of a

820

mile trip. Insert

820

into each function, then calculate and compare to tell which deal is better. Let's start with Proxy rental company.

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Lesson Check p.64

Practice and Problem-Solving Exercises p.65-67

Standardized Test Prep p.67

Mixed Review p.67