book Maths Puzzle Numerical Ability

im trying to solve for varibles in a matrice:

[3x 4y] = [27 -16]
-48 49 -3w 7z

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book Other Question

How do you solve 2[y-4(y=3)]-6(y-1) When y=5 By considering factors, find the smallest value of x such that 120x will be a perfect square.