[" 21.The length of the perpendicular from the origin to a line is "7" and the line "],[" makes an angle of "150^(@)" with the positive direction of "y" -axis.Then find the "],[" equation of the line."],[" 22,Find the equation of the straight line upon which the length of the "],[" perpendicular from the origin is "2" and this perpendicular makes an angle of "30^(@)],[" with the positive direction of "y" -axis (in clockwise direction)."]