a, b, c are the components of the plane normal;
x, y, z are the components of the known point on the plane;
x0, y0, z0 are the point that we test to see if it's on the plane;
why do we say that the plane equation is
ax + by + cz + d = 0where d is basically a "complex" term in the equation ( d = -ax0 - by0 - cy0 ) that needs to be developed to get a result from the equation.
ax + by + cz - ax0 - by0 - cy0 = 0I (think I) understand the equations, and that they are the same, just no why we use the 'd' notation.