298 MATHEMATICS- (a) No (b) No (c) Yes (d) No (e) No (f) No
- (i) p = 3 (ii) m = 6
- (i) x + 4 = 9 (ii) y – 2 = 8 (iii) 10a = 70 (iv)
b
5 = 6(v)
3
4t
= 15 (vi) 7m + 7 = 77 (vii) x
4- 4 = 4 (viii) 6y – 6 = 60
(ix) 3 330
z- (i) The sum of p and 4 is 15 (ii) 7 subtracted from m is 3
(iii) Twice a number m is 7 (iv) One-fifth of a number mis 3
(v) Three-fifth of a number mis 6 (vi) Three times a number pwhen added to 4 gives 25
(vii) 2 subtracted from four times a number pis 18
(viii) Add 2 to half of a number pto get 8 - (i) 5 m + 7 = 37 (ii) 3y + 4 = 49 (iii) 2l + 7 = 87 (iv) 4b = 180°
EXERCISE 4.2
- (a) Add 1 to both sides; x = 1 (b) Subtract 1 from both sides; x = –1
(c) Add 1 to both sides; x = 6 (d) Subtract 6 from both sides; x = – 4
(e) Add 4 to both sides; y = –3 (f) Add 4 to both sides; y = 8
(g) Subtract 4 from both sides; y = 0 (h) Subtract 4 from both sides; y = – 8 - (a) Divide both sides by 3; l = 14 (b) Multiply both sides by 2; b = 12
(c) Multiply both sides by 7; p = 28 (d) Divide both sides by 4; x =25
4(e) Divide both sides by 8; y =
36
8 (f) Multiply both sides by 3; z =15
4(g) Multiply both sides by 5; a =
7
3
(h) Divide both sides by 20; t =
1
2- (a) Step 1: Add 2 to both sides (b) Step 1: Subtract 7 from both sides
Step 2: Divide both sides by 3; n = 16 Step 2: Divide both sides by 5; m = 2
(c) Step 1: Multiply both sides by 3 (d) Step 1: Multiply both sides 10
Step 2: Divide both sides by 20; p = 6 Step 2: Divide both sides by 3; p = 20 - (a) p = 10 (b) p = 9 (c) p = 20 (d) p = –15 (e) p = 8 (f) s = –3
(g) s = – 4 (h) s = 0 (i) q = 3 (j) q = 3 (k) q = –3 (l) q = 3