### Home > A2C > Chapter 7 > Lesson 7.3.4 > Problem7-202

7-202.
1. Represent each system of equations below with matrices. You do not have to solve the systems. Homework Help ✎

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

2. 4m − 5n = −2
−3m + 4n = 9

3. 4x − y + z = −5
2x + 2y + 3z = 10
5x − 2y + 6z = 1

4. 7w − 3x + 2z = 41
−2w + x − z = −13
4w + y − 2z = 12
2 − 3x = 1

$\begin{bmatrix} 1&2\\ 3&4 \end{bmatrix}\begin{bmatrix} p\\ q \end{bmatrix}=\begin{bmatrix} 7\\ 11 \end{bmatrix}$

See part (a).

See parts (a) and (c); rearranging the equations so the variables are in the same order helps.
Notice that there are four variables in total;filling in 0's for the missing variables is also helpful.