Answer:
What is Joint Variation and Combined Variation?
Joint variation is a variation where a quantity varies directly as the product of two or more other quantities. For example, the area of a rectangle varies whenever its length or its width varies. We say that A ∝ lw, where A is the area, l is the length and w is the width.
Combined variation is a variation where a quantity depends on two (or more) other quantities, and varies directly with some of them and varies inversely with others.
