Which term describes operations that undo each other?

The term that describes operations that undo each other is inverse operations. In mathematics, operations such as addition and subtraction are considered inverses of each other, as are multiplication and division. For example, if you add a number and then subtract the same number, you return to your original number; likewise, multiplying a number and then dividing it by the same number also leads you back to where you started.

This relationship is crucial in solving equations. When you perform an operation on one side of an equation, you typically use the inverse operation on the other side to maintain balance. Understanding inverse operations helps in various mathematical contexts, including algebra, where solving for an unknown variable often involves applying these properties to isolate the variable. The other options do not accurately define this concept.