Math Module 2 (Easy) Question 21

The correct answer is Choice C.

Move all the other terms to one side to isolate the term, $a$, of interest.

Choice A is incorrect and may result from subtracting 3 instead of dividing 3 from both sides.

Choice B is incorrect and may result from a sign error when isolating $a$.

Choice D is incorrect and may result from multiplying 3 instead of dividing 3 from both sides.

✨ Expert's Tip ✨

To solve for three variables, three equations are required. In general, to find $n$ variables, $n$ equations are required.