2. –

3. 42
11 – )9 – )6

4. 42
11 – )9 – )6
(39
x = -5
y = 15
(1
x
x=7
y
y

5. 42
11 – )9 – )6
(39
t=4
r = - 20
t
t = -6
r
r

6. 42
11 – )9 – )6

7. 42
11 – )9 – )6
(39
y
z x
y = 20
2
y
z=2 x=9
x=5 z=3

8. 42
11 – )9 – )6
(39
r
t v
r = 70
r
t=8 v=2
t = 4 v = 10

9. 42
11 – )9 – )6

10. 42
11 – )9 – )6
(3
(40
b = -2
a = 28
b
b = -10
a
a

11. 42
11 – )9 – )6
(40
y=4
x = 24
y
y = 12
x
x

12. 42
11 – )9 – )6
(39
(1

13. 42
11 – )9 – )6

14. 42
11 – )9 – )6
(41
h
g
(5
g
f
f=6 h=2
g = 24
h = -3 f = 18

15. 42
11 – )9 – )6
(41
t
t
r
p
r=2 p=4
t = 20
p = - 5 r = 10

16. 42
11 – )9 – )6

17. 42
11 – )9 – )6