exam Maths Puzzle Numerical Ability

Could you please help me with solving this system of equation using multiplication? I get how to solve problems with addition anbd subtraction just not multiplication. Thanks
x+3y=-2
2x+y=6

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exam Other Question

Apply using quadratic formula to find the roots and graph.
g(x)= x^2 - x - 12
please help to simplify

m^x/3*n^3x

DIVIDED BY

m^2x*n^3x/4