exam Maths Puzzle Numerical Ability

solve each system of equations by using either substitution or elimination.

2x-y=-5
4x+y=2

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exam Other Question

Find the variation constant and an equation of variation where y varies directly as x and y=12 when x=3. The variation constant is k= ???
the equation of variation is y=??? Prove that if and B are square martices and AB is invertible, then both A and B are invertible.
i am not sure where to start. I know that because it is a proof you can't use an e