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direct variation, and in the equation y=kx the k ca NOT equal 0.
y = k/x of xy = k where k is a constant.
y = kx, where k is a constant, and x and y are the two variables.
Newton's equation of cooling is a differential equation. If K is the temperature of a body at time t, then dK/dt = -r*(K - Kamb) where Kamb is the temperature of the surrounding, and r is a positive constant.
Two variables, X and Y are said to be in inverse variation if XY = k or Y = k/X for some constant k.