exam Maths Puzzle Numerical Ability

x^2+xsqrt2-2=0

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exam Other Question

Please help. Solve by substitution:
5x-2y=-5
y-5x=3 Can someone explain how I am supposed to solve by substitution with the problems x-y=5 x+2y=7 and 3b+2a=2 -2b+2a=8