exam Maths Puzzle Numerical Ability

I would like you to help me with this problem: 5x-9y=11, 3x+7y=19.

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exam Other Question

solve log(2x+3) = log(4x)+ 2, for x giving your answer correct to 3 significant figures s^2-13s+42=0

a^2+2a-35=0

v^2-15v+54

v^2+12v+27=0