exam Maths Puzzle Numerical Ability

2x-y=8
I know how to do it but i get confused with the negative sign.
HELP PLEASE!

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exam Other Question

Could I havehelp with this problem please* Find an equation of variation for the given situation. y varies inversely as the square of x, and y=6 when x=3 Solve by substitution or elimination method:
1. 3x - 2y = 8
-12x + 88 = 32

2. 7x - 5y = 14
-4x + y = 27

3. -4x + 3y = 5
12x - 9y = -15