# How do you solve #4p + 2q - 5r + 9s = -12#, #2p + 6r - 7s = 0#, #11q – 7r = -18#, #p + q - r + s = 1# using matrices?

##### 1 Answer

Nov 6, 2016

#### Explanation:

Here is the augmented matrix for the 4 equations:

The row operations required to resolve the above into an augmented identity matrix exceeds the limits placed on the length of an explanation. Here is the final matrix: