If we have to find the equation of the plane determined with two lines for example

and also we know that the lines intersect in a point K.

the normal vector of the plane we find using cross product of vectors from lines.

we find the eqution using this formula

it is wrong to take the point of or ?

should we take the point as ??

and can someone explain if we take different points of the plane to find the equation we get different equations but it's still the same plane, should we write the equations in normal form?

thanks for any reply!