Question
The equations of three planes 
		  are
		
			
		respectively, where
		 and 
		 are constants.
		
			When  and
			 find the coordinates of the point at which the three planes meet.
		
  [2]
				
		
		The planes  and  intersect in a line 
					
				(i)
					
					Find a vector equation of 
					[4]
						
				
				
				(ii)
					
					Given that  lies in  find  and 
					[3]
						
				
				
				(iii)
					
					Given instead that  and  have no point in common, what can be
		said about the values of  and 
					[2]
						
				
				
				(iv)
					
					Find the cartesian equation of the plane which contains 
		and the point 
					[4]