[" 7.Find the equation of the plane with intercept "3" on the "y" -axis and parallel to "70X],[" 8.Find the equation of the plane with intercept "3" on the "y" -axis and parallel to "70X],[" plane."],[" 9.Find the equation of the plane through the intersection of the planes "],[" and the "2c" .As "Q" and "x" the "2=0" and the point "(2,2,1)" ."]