exam Maths Puzzle Numerical Ability

How do you solve the equation m - 2n = 9 if the domain is { -1, 0, 5}?

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exam Other Question

Solve each system by substitution. Determine whether each system is independent, inconsistent, or dependent

3x - 2y = 7
-3x + y = 5
I dont understand how to set up and write a proof like when it tells me whats given and what i have to prove i dont know how to prove it