1) y-4,2y+6,3y-9,3=0
-3.2y+6.3y-9.3=0
3.1y-9.3=0
y=9.3/3.1
y=3
2) -3,1z-2,7-4,6z+1,2=0,3
-7.7z-1.5-0.3=0
-7.7z-1.8=0
z=-1.8/7.7z=-18/77 (~-0.234)
1) y-4,2y+6,3y-9,3=0
-3.2y+6.3y-9.3=0
3.1y-9.3=0
y=9.3/3.1
y=3
2) -3,1z-2,7-4,6z+1,2=0,3
-7.7z-1.5-0.3=0
-7.7z-1.8=0
z=-1.8/7.7
z=-18/77 (~-0.234)