constant of variation

The number k in the variation equations y = kx, or y = k/x, or y = kxz.

y varies jointly as x and z if there exists a real number k such that y = kxz.

y varies directly as x and z if there exists a real number k such that y = kx.

y varies inversely as x and z if there exists a real number k such that y = k/x.

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FOCA_4.2

Vocabulary for FOCA_4.2

Term	Definition
constant of variation	The number k in the variation equations y = kx, or y = k/x, or y = kxz.
joint variation	y varies jointly as x and z if there exists a real number k such that y = kxz.
direct variation	y varies directly as x and z if there exists a real number k such that y = kx.
inverse variation	y varies inversely as x and z if there exists a real number k such that y = k/x.