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Home > A2C > Chapter 7 > Lesson 7.3.5 > Problem 7-219

7-219.
  1. Use matrices to solve these systems. Check your answers by substituting them in the original equations. You will not need a calculator if you use the results of the previous problem. Homework Help ✎

    1. p + 2q = 7
      3p + 4q = 11

    2. 4m − 5n = −2
      −3m + 4n = 9

First substitute matrices for the equations.

Multiply both sides by the inverse.

Solve for p and q.

See part (a).