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

I dont understand how to solve a problem that states : Find the area of a rectangle with L=2x+3 and W = x-2 Dear Abbey can you help me with these problems? Show me a step by step way of doing it? 4x < 36
-4 < 36
4x >-36
Thank You very much!