Solve each problem. See the strategy for problem solving.STRATEGY Problem Solving1. Read t...
Solve each problem. See the strategy for problem solving.
STRATEGY Problem Solving
1. Read the problem as many times as necessary to get an understanding of the problem.
2. If possible, draw a diagram to illustrate the problem.
3. Choose a variable, write down what it represents, and if possible, represent any other unknown quantities in terms of that variable.
4. Write an equation that models the situation. You may be able to use a known formula, or you may have to write an equation that models only that particular problem.
5. Solve the equation.
6. Check your answer by using it to solve the original problem (not just the equation).
7. Answer the question posed in the original problem.
Dining In Revenue for restaurants and supermarkets can be modeled by the equations R = 13.5n + 190 and S = 7.5n + 225, where n is the number of years since 1986 (Forbes, www.forbes.com).
a. Use the accompanying graph to estimate the year in which restaurant and supermarket revenue were equal.
b. Use the equations to find the year in which restaurant and supermarket revenue were equal.
Figure
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