Answer quickly for 50 points, thank you.

The incorrect answer is B.
All you have to do is plug in x to the formulas and see if the are equal.
4x - 2 = 3x + 6
4(8) - 2 = 3(8) + 6
30 = 30
CORRECT
The second is not only not equal, but it is the wrong kind of formula for what you are trying to prove there.
Hope that helps!
Option B is incorrect this is because 3x+6 = 4x - 2 so add 2 to both sides and it becomes 3x+8=4x there for x is 8