Chapter 4 Simple Equations Exercise 4.3

Chapter 4 Simple Equations Exercise 4.3

Question 1.
Solve the following equations:

Solution:

(b) 3(n – 5) = 21
⇒  (Dividing both sides by 3)
⇒ n – 5 = 7
⇒ n = 7 + 5 (Transposing 5 to RHS)
n = 12
Check: Put n = 12 in LHS
3(12 – 5) = 3 × 7 = 21 RHS as required

Question 3.
Solve the following equations:
(a) 4 = 5(p- 2)
(b) -4 = 5(p – 2)
(c) 16 = 4 + 3 (t + 2)
(d) 4 + 5(p – 1) = 34
(e) 0 = 16 + 4(m – 6)
Solution:

Question 4.
(a) Construct 3 equations starting with x = 2
(b) Construct 3 equations starting with x – -2.
Solution:
(a) Possible equations are:

(b) Possible equations are:
3x= -6; 3x + 7 = 1; 3x + 10 = 4