exam Maths Puzzle Numerical Ability

Solve by elimination:

2x + 3y = 21
5x - 2y = -14

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exam Other Question

Compute the exact value of tan{tan^-1{1/5}+ tan^-1{2/3}} Find the variation constant and an equation of variation where y varies directly as x and y=8 when x=4. The variation constant is k=?. The equation of variation is y=?