exam Maths Puzzle Numerical Ability

SOLVE THE SYSTEM OF EQUATIONS USING MATRICES AND IDENTIFYTHE SOLUTION

2X-3Y+11Z=10
-2X+2Y-7Z=6

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exam Other Question

-2(3y-)=56
Help!!! 5/(2x-4) - 3/(2-x) is the problem
this is what I have done
5/2(x-2) - 3/(2-x)
I know the quotient of a-b and b-a is -1 which is what x-2 and 2-x are
BUT WHAT NOW ???? how does this information help me?