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Back to 11.6 Solving Systems with Gaussian Elimination

11.6 Exercise 78

Avg difficulty 2.5

Set up the augmented matrix that describes the situation, and solve for the desired solution.

You invested $2,300 into account 1, and $2,700 into account 2. If the total amount of interest after one year is $254, and account 2 has 1.5 times the interest rate of account 1, what are the interest rates? Assume simple interest rates.

OpenStax Algebra and Trigonometry 2e, 11.6 Solving Systems with Gaussian Elimination, exercise 78

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Adapted from College Algebra © 2021 Rice University. Licensed under CC BY 4.0. Sources: College Algebra 2e, Algebra and Trigonometry 2e, Precalculus 2e, College Algebra with Corequisite Support 2e. Imported at revision 4922e46.