Concept explainers
To find:
Use any problem-solving strategy to solve each problem.
Suppose stamps for postcards cost $0.28 and stamps for first-class letters cost $0.44. Diego wanted to send postcards and letters to 10 friends. If he had $3.60 for stamps and spends all of it, how many postcards and how many letters could he send?
Answer to Problem 1PR
Explanation of Solution
Given:
Calculation:
Assign variables for the unknown values. Let x be the number of postcards and y be the number of letters. Write a system of equations for the given situation.
Use
Use
Since the value of y is known, substitute this to the second equation to determine the value of x.
Diego can send 5 postcards and 5 letters.
Conclusion:
5 postcards and 5 letters
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