exam Maths Puzzle Numerical Ability

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

4m-n=9

how do I figure this out...thanks for your help!

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exam Other Question

Here is my question:


6 - sqrt of 20
-------------- = ?????
2

I came up with 6 - sqrt of 5. I am not sure if this is correct. I need someone to let me know if I am doing this stuff correctly, please.
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