Conditions for Homogeneity
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Theorem
Straight Line
The line $L = \alpha_1 x_1 + \alpha_2 x_2 = \beta$ is homogeneous if and only if $\beta = 0$.
Plane
The plane $P = \alpha_1 x_1 + \alpha_2 x_2 + \alpha_3 x_3 = \gamma$ is homogeneous if and only if $\gamma = 0$.