①x=9+6y 3x-7y38 ②3x-4y=8 x+4y=4 ③3x+7y=23 4x-3y=6 ④2x-1=y+2/

①x=9+6y 3x-7y=38
3(9+6y) -7y=38
27+18y-7y=38
11y=11
y=1 x=15
②3x-4y=8 x+4y=4
3(4-4y)-4y=8
-16y=-4
y=1/4 x=3
③3x+7y=23 3x=23-7y
12x-9y=18
92-28y-9y=18
74=37y
y=2 x=3
④2x-1=y+2/3
y-1/2=y-x x=1/2
y=-2/3
⑤x+y=1
y+z=2 x-z=-1
z+x=3
x=1 y=0
z=2