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Unformatted text preview: x (or y varies directly as x ) y = kx for some nonzero constant of proportionality (or constant of variation ) k . WARNING 1 : k could be negative, so y does not necessarily increase as x increases. y is inversely proportional to x (or y varies inversely as x ) y = k x for some nonzero k . z is jointly proportional to x and y (or z varies jointly as x and y ) z = kxy for some nonzero k ....
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This document was uploaded on 12/29/2011.
- Spring '09