exam Maths Puzzle Numerical Ability

how do i sove this problem (step by step)
x-y=5 x+2y=7

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exam Other Question

Let x be a real number. Compare: (a) square root of x^2 (b) x Tell wether the number is prime or composite. If it is composite,write its prime factorization.

6. 114

Any help with this equation would be GREATLY appreciated.