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

could the following lengths form a trinagle? yes or no 1.) 7,5,2 2.) 9,12,13 3.) 12,2,19 what is the expanded and simplified form of 4 over E N=0 N^2/2?