exam Maths Puzzle Numerical Ability

solve the following of linear equation by elimination, i.e. solve for x and y, and explain the meaning of the answer:
3x+4y=-3
-6x-8y=6

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Could someone help me on this problem?

I need to evaluate the following problem.

4- (-3) + 1/1-1 divided by (-2)

Thanks,
Lyn z^2-2y+7z^2-2y+6z^2-22z^3+2-16y+2z^3 (Simplify) like terms