exam Maths Puzzle Numerical Ability

DECIDE WHICH OF THE TWO POINTS IS A SOLUTION OF THE EQUATION.

X+Y=8
A.(2,4)
B.(2,6)

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Hello, I am in deep need of help. I am suppose to use the sqrt property to solve equation.
(a-2)^2=8
Thanks for anyone that can help. Graph the equations. Make a table of solutions
1. 3x-y=2 2. y-4=3x