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

7-219.

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 ✎

*p*+ 2*q*= 7

3*p*+ 4*q*= 114

*m*− 5*n*= −2

−3*m*+ 4*n*= 9

First substitute matrices for the equations.

Multiply both sides by the inverse.

Solve for *p* and *q*.

See part (a).