Equation of Planes Parallel to Axes

Q. The equation of a plane parallel to x - axis is

1. ax+by+cz+d=0
2. ax+by+d=0
3. by+cz+d=0
4. ax+cz+d=0

Q. A plane $\pi$ makes intercept 3 and 4 respectively on z - axis and x - axis. If $\pi$ is parallel to y - axis, then its equation is

1. 3x+4z=12
2. 3z+4x=12
3. 3y+4z=12
4. 3z+4y=12

Q. The equation of a plane parallel to x - axis is

1. ax+by+cz+d=0
2. ax+by+d=0
3. by+cz+d=0
4. ax+cz+d=0