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**1. Homework Statement**

[tex]\vec{PM_1}=d*\vec{n_0}[/tex]

Here are the both pictures.

"[URL [Broken] 0401.jpg"]Picture 1.[/URL]

"[URL [Broken] 0502.jpg"]

Picture 2[/URL]

**2. Homework Equations**

[tex]d = \frac{\left | a x_1 + b y_1 + c z_1+d \right |}{\sqrt{a^2+b^2+c^2}}.[/tex]

**3. The Attempt at a Solution**

Why in my book says that, if d > 0 then the coordinate M is of opposite site of the plane (relative to the (0,0,0)), and if it is d < 0 it is on same site of the plane (relative to (0,0,0)) when d is always positive?

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