#1.
[tex]3x-6y=-12[/tex] [tex]= x=2y-4[/tex] and for y
[tex]y= \frac{x}{2} +2[/tex]
also 
3	x		-6	y	=	-12	.............1				
 1	y	=	2	+	0.5	x	---------2				
 /	1	=									
	y	=	2	+	0.5	x					
   
 
 Substitute y in 		(1)									
 3	x		-6	(	2	+	0.5	x	)	=	-12
 3	x		-12	+	-3	x	=	-12			
 3	x		-3	x	=	-12	12				
 0	x	=	0								
 There is no solution to the system. The lines are parallel with same slope of (1/2) & different intercepts