Final answer:
The subject of this question is Mathematics, and the correct option is Solving methods. When solving absolute value equations using the step-by-step method, you isolate the absolute value expression and consider both positive and negative cases to find the solution set.
Step-by-step explanation:
The subject of this question is Mathematics. The correct option for the question is A) Solving methods. When solving absolute value equations using the step-by-step method, you isolate the absolute value expression and consider two cases: when the expression inside the absolute value is positive and when it's negative. You then solve each case separately to find the solution set.