If y - 4 = 2, what is the value of y?

To find the value of y in the equation y - 4 = 2, the first step is to isolate y on one side of the equation. This can be done by adding 4 to both sides.

Starting with the original equation:

y - 4 = 2

Add 4 to both sides:

y - 4 + 4 = 2 + 4

This simplifies to:

y = 6

Therefore, the value of y is 6.

Recognizing this, it becomes clear why other options do not fit. The value 5 would result from subtracting 4 from the wrong side of the equation, while 4 and numbers greater than 6 would not satisfy the original equation when substituted back. Thus, the correct answer is indeed 6.