Joint variation can be said to be a variation that involves one variable which depends on two or more variables, then varies directly as each of them where the other variables are constant.
When we say z varies jointly as x and y, it is expressed as:
z = kxy
Where k is the constant of proportionality
Joint variation is also a direct variation whcih involves two or more variables.
Therefore, the statement "joint variation is a combination of inverse variation is FALSE.
ANSWER:
False