Page 186 - Mathematics

Revision exercise 5

1. (a) 16a (c) 0.7x− + 4.1y
3
(b) 7m (d) 5x +
4

y
3. (a) 10mn− (c) 9x +
(b) 6k− − 5n − 5 (d) 5x− + 5y

5. (a) 120abmn (b) 42mn− (c) − ax + 6bx
15
7. (a) 80 (b) 4− (c)
Tanzania Institute of Education
2
15
9. (a) x = (b) x = − (c) x = 30 (d) x = 10
6
13
7 5 25 29
(e) x = (f) x = (g) x = (h) x =
8 2 4 19
11. Age of father is 55 years and James is 11 years.
11 22
13. (a) x = 3, y = 6 (b) x = , y =
5 5
(c) x = 2, y = 6 (d) x = 10, y = 7

15. (a) x = 10, y = 11 (b) x = 8, y = 5
3 5
(c) x = , y = (d) x = 2, y = 6
2 4
17. x = 15, y = 32
5
19. (a) x > (b) x ≤ 1 (c) x <− 1
2
1 9
(d) x ≥ (e) x ≥ (f) x <− 2
4 8
5
21. x = 3, y =
2 25. x y+= 102
3
Mathematics Form One 27. (a) x = 4 or x = 16 19 (d) x = 7 19 or x = 17 17
23.
8

or x = −
(c) x =
7
3
5

1
3
−
−
or x = −
(b) x =
7
7
11
180

25/10/2024 09:52:20
Mathematics form 1.indd 180
Mathematics form 1.indd 180 25/10/2024 09:52:20