book Maths Puzzle Numerical Ability

what is a vairable

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book Other Question

(-2)^2-3^2/6 divided by 3(2)^-2
Please solve
Plus what symbol do you put for divided
determine whether the given ordered pair is a solution of the system of equations.

#1

(4,2); x-y=2
x+y=6

#2

(-8,-7); x-2y=6
2x-3y=5