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Concept explainers
Interestingly, this technique can also be used to solve problems that could be solved by writing a single equation, like the next one.
While traveling on business, Eldrick bought a $50 prepaid international cell phone to call his girlfriend Lindsey. Calls cost $0.07 per minute. How many minutes has he used if the display shows $32.15 remaining?
To answer this question we could think about two different equations. One states that the value of the card V is $32.15.
Next we can write another equation that states that the value V started at $50 and decreased by $0.07 for each minute used x.
Now solve the system using the substitution method. Did you get the same solution? Use this result to solve the original problem.
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Chapter 3 Solutions
PATHWAYS TO MATH (LL) GEN CMB W/ACCESS
- Algebra: Structure And Method, Book 1AlgebraISBN:9780395977224Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. ColePublisher:McDougal LittellAlgebra for College StudentsAlgebraISBN:9781285195780Author:Jerome E. Kaufmann, Karen L. SchwittersPublisher:Cengage LearningIntermediate AlgebraAlgebraISBN:9781285195728Author:Jerome E. Kaufmann, Karen L. SchwittersPublisher:Cengage Learning
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt
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