book Maths Puzzle Numerical Ability

i forgot what the algebraic method was...here is my equation to solve...

x-y=3
-2x+2y=-6

thank you....

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Please help.

(1/3)y2 + 12=5x where x=3


Note: the 2 next to the y means y to the second power. Thanks.
-6y = 960

18w = -234


375 = 14x + (=17)