Solving Systems with Gaussian Elimination · Exercise 56

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

You invested $10,000 into two accounts: one that has simple 3% interest, the other with 2.5% interest. If your total interest payment after one year was $283.50, how much was in each account after the year passed?

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §11.6 Solving Systems with Gaussian Elimination · Exercise 56