Final answer:
The subject of the question is Coding or Programming, and the answer is D. A and B.
Step-by-step explanation:
The subject of the question is Coding or Programming. Coding involves writing instructions in a programming language to create computer programs. In this case, the student is looking for a way to find the value of y that corresponds to a given value of x.
To solve this, we need to look at the given equations. Equations A, B, and C are all linear equations, meaning they represent a straight line when graphed. In equation A, y is directly proportional to x with a slope of -3. In equation B, y is a constant term plus a term multiplying x. In equation C, y is a constant term minus a term multiplying x. So, the answer is D. A and B.