exam Maths Puzzle Numerical Ability

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

Please help i do not understand how to do this problem?

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exam Other Question
how do i make an input-output table for a function? hello can some one check this for me please?
i have to find the x intercepts
y=x^2+2x-3
y=0
o=(x+4)(x-2)
x=-4
or
x=2