The equation of plane passes through the point (1,2,-1) and perpandicular to the line of intersection of the plane
3x-y+z = 1 and x+4y+2z = 2
This one looks easier because the line of intersection is normal to the required plane.
Do you know how to get the plane from this ?
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei