In Algebra, sometimes we have functions that vary in more than one element. When this happens, we say that the functions have joint variation or combined variation. Joint variation is direct variation to more than one variable (for example, d = (r)(t)). With combined variation, we have both direct variation and indirect variation.
Sample Problems (2)
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'a' varies jointly to 'b' and the square of 'c' and inversely to 'd'.
Your BMI varies directly as your weight (in pounds) and inversely as the square of your height (in inches).