Answer :

The given system of linear equations is :-


+ - = 1


- + = 1


- + + = 1


Let = p , = q , = r


The equation becomes,


+ - = 1


- + = 1


- + + = 1


The matrix equation corresponding to the above system of equation is



Let A =


|A| =


Taking common from , from and from we get,


|A| = = 0


A unique solution exists.

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