1.x-y+6=0 ...(1)2x+y-1=0 ...(2)(1)+(2):3x+5=0,x=-5/3y=x+6=6-5/3=13/32.2x+3y+2=0 ,6x+9y+6=0 ...(1)3x-2y+1=0 ,6x-4y+2=0 ...(2)(1)-(2):13y+4=0,y=-4/13x=-(3y+2)/2=-(2-12/13)/2=-14/13/2=-7/13