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Chapter 5: Q. 191 (page 644)
A married couple together earn \(75,000. The husband earns \)15,000 more than five times what his wife earns. What does the wife earn?
Wife earns $10,000
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In the following exercises, solve the following systems of equations by graphing.
Solve a System of Equations by Elimination -
Stephanie left Riverside, California, driving her motorhome north on Interstate 15 towards Salt Lake City at a speed of 56 miles per hour. Half an hour later, Tina left Riverside in her car on the same route as Stephanie, driving 70 miles per hour. Solve the system
(a) for t to find out how long it will take Tina to catch up to Stephanie.
(b) what is the value of s, the number of hours Stephanie will have driven before Tina catches up to her?
In the following exercises, translate to a system of equations and solve.
At the end of spring break, Lucy left the beach and drove back towards home, driving at a rate of 40 mph. Lucy’s friend left the beach for home 30 minutes (half an hour) later, and drove 50 mph. How long did it take Lucy’s friend to
catch up to Lucy?
In the following exercises, solve the following systems of equations by graphing.
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