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**tester85** Find the value a for which the following system of linear equations has no solution. Solve the system when a = 1.

x1 + 2x2 + 3x3 = 13 .... (1)

-2x1 + x2 - x3 = 4 .... (2)

3x1 + ax3 = -1 .... (3)

I am able to do the following. Solve the system when a = 1. The answer i got is x1 = -1, x2 = 4, x3 = 2. which is correct

But i am not sure on how to do this ? **Find the value a for which the following system of linear equations has no solution.**

Any help provided will be greatly appericiated.