book Maths Puzzle Numerical Ability

m(x)=3x

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This question is on elimination...and it is also my last question... i just wanted you to check my answers to make sure that they were right.
-1/3x-4/3y=-2
1/3x-2/3y=4

My answer was (4,-4) Is this right?
thank you so so much!~
i would like some one to shwo me how to do this equation please.

2/3(5y-4)-3/5(2y+8)=0