Given x+y+z=7 2x+3y+z=18 x+y3z=1 (A) solve by performing elementary row

Question

Given:

x+y+z=7

2x+3y+z=18

-x+y-3z=1

(A). solve by performing elementary row

operations on the augmented matrix.(B). based on the answer in part (A) what can you say about the invertibility of the coefficient matrix? Justify your answer.

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