Answer:
D; it is NOT a step in the process.
Explanation:
You would not subtract 6 from either side of the equation, you would only add.
q-6=-2
+6 +6
q=4.
A is correct because you would want to check if your solution is correct by substituting q for 4:
4-6=-2 (which is true)
B is correct, because as previously stated, you must add 6 to both sides to get the correct answer.
C is correct because the question specifies graphing the solution.