Question

In a space with an orthonormal coordinate system consider the plane;
&: 4x-3y=12

(a)(i)Find the coordinates of the points of intersection of the plane & with the coordinates axes (=axes intersections???)
(ii)Find the parametric equations for the line of intersection of the plane & and the xy-plane.
Need to know the xy-plane, but how do you find that???

(b)(i)Find the coordinates of the point P, which is the reflection of the origin O in &.
(ii)Find cartesian equations of the planes which are parallel to & and at a distance of 4 from &.

I really don't know how to start any of this. Thank you for any help!