exam Maths Puzzle Numerical Ability

Solve for x and y:

x*2 + y = 7
x + y*2 = 11

I can see that the answer is x = 2, y = 3 BUT how can it be solved other than by graphing?

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exam Other Question
5a
--- = 75
2 Could you please help me solve this, Thank you.

Given U = {All letters of the alphabet} A = {b, c, d} and B = {c, e, f, g}
List the elements of set
(a) A U B (b) A &#87