exam Maths Puzzle Numerical Ability

Ok, I answered this but I want to make sure that I got it right before turning it in.

Solve the system by addition or substitution.
3x - 4y = 8
6x - 2y = 10

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exam Other Question
Give ordered pair (m,n) of numbers that satisfy the equation

4m-n=9

how do I figure this out...thanks for your help! I am trying to find out the answer to this question. What does this graph look like, -4,10