book Maths Puzzle Numerical Ability

how do u do this 2x+3y=(-4)
x+y=(-2)

and this x+2y=0
y=3

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book Other Question

If one and one-half teams of men require one and one-half days to shovel one and one-half truckloads of sand, how long will it take one teams to shovel one truckload? name the property of 2+3=3+2