exam Maths Puzzle Numerical Ability

5x-4y+4z=18
-x+3y-4z=11
4x-2y+7z=3

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exam Other Question

Can somebody help me with the graph on this problem? Stanborn was kind enough to work out the problem but he wasn't able to do the graph.
The problem is: A small firm produces find a counterexample, that is, find real values for which the statement is false.
a/b=b/a