Chapter 18.5 (Mathematics 5)

Solving Simple Equations (2)

Solving equations involving multiplication and division

Example 6a. Division

Solve the equation 4x = 8

  1. 4x = 8
  2.   4x4 = 84
    Divide both sides by 4​
  3. x = 2

Example 6b. Multiplication

Solve the equation  13 y = 2

  1. 13 y = 2
  2. 3 × 13 y = 3 ×2
  3. y = 6

Exercise E

  1. Think of a number (n).
    Multiply the number by 2.
    The answer is 8. Find the number.
    Eq: n = | *
    Answer. The number is 
  2. Think of a number (m)
    Divide the number by 6.
    The answer is 12. Find the number.
    Eq:   =  | * 
    Answer. The number is 
* the mathematical operation required to solve the equation

a) 3x = 9

x = 

b) 5y = 25

y = 

c) 3w = 63

w = 

d)  13 y = 3

y = 

e)  12 b = 9

b = 

f)  15 p = 4

p = 

  1. 15y = 105
    y =   
    y = 
  2. 8r = 128
    r =   
    r = 
  3. 24z = 360
    z =   
    z = 

Eq: x = 

Answer. Muli is  years old.

Eq:    = 

Answer. Job share  fruits.

Eq:  = 

Answer. Sh  was the price of one pen.