Math Variation
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varies directly or directly proportional
x=ky Two varibles change in the same manner. If one gets larger, the other gets larger. If one gets smaller the other gets smaller.
varies inversely or inversely proportional
x=y/k Two variables change in reverse manners; one varies directly with the reciprocal of the other. If one gets larger, the other gets smaller. If one gets smaller the other gets larger.
varies jointly or jointly proportional
x=yzk One variable changes as the product of 2 or more variables. i.e. volume.