Incremental Method

Would like an incremental method similar to that used for X,Y

Need to compute dz/dx, dz/dy values

Plane Equation: Ax + By +Cz + D = 0

Solve for Z: z = (-D - Ax - By) / (C)

Evaluate at (x,y,z) and (x+Dx,y,z)

f(x+Dx,y,z) - f(x,y,z) = (-D - A(x+Dx) - By)/(C) - (-D -Ax -By)/(C)

dz / dx = -A/C * (Dx)

But Dx is just equal to 1, so dz/dx = -A/C.

Similiarly, dz/dy = -B/C

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