Answer :


To find: - x , y , z


Given set of lines are : -


x + y - z = 1


3x + y - 2z = 3


x - y - z = - 1


Converting the following equations in matrix form,


AX = B



R2 – 3R1


R3 – R1



Again converting into equations we get


X + y – z = 1


- 2y + z = 0


- 2y = - 2


Y = 1


- 2 + z = 0


Z = 2


X + 1 - 2 = 1


X = 2



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