exam Maths Puzzle Numerical Ability

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Slove for "x"

7x+5y=23
3x-y=4

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exam Other Question

The process of writing a quadratic equasion in the form (x + a)^2 = b is known as?__________________________
(PS: Please show how you worked it out. I have been having mojor problems with these kinds of questions. Thanks.) 2 the square root of 9x + 3 the square root of 25x - the square root of x