book Maths Puzzle Numerical Ability

x-4y=8
x=8/-4y
x=-2 over y

2x+y=-3
2x-3=y

2x+y=-3

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book Other Question

Evaluate C (10, 4) (-2)^2-3^2/6 divided by 3(2)^-2
Please solve
Plus what symbol do you put for divided