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Chapter 18.6 (Mathematics 5)

Solving Simple Equations (3)

Examples

Example 7a

Solve the equation 3x + 5 = 26

  1. 3x + 5 = 26
  2. 3x + 5 – 5 = 26 – 5
    Subtract 5 from both sides​
  3. 3x = 21
    3x
    Divide both sides by 3
  4. x = 7​​

Example 7b

Solve the equation 2y – 11 = 19

  1. 2y – 11 = 19
  2. 2y – 11 + 11 = 19 + 11
    Add 11 to both sides​
  3. 2y = 30
    2y 2 = 302
    Divide both sides by 2
  4. y = 15​​

Exercise F

In pairs, solve the equations:

  1. 2x + 1 = 7 |  
    2x =  |  
    x = 
  2. 3y – 4 = 11 |  
     =  |  
    y =  
  3. 13 p + 1 = 3 |  
    13 p =  |  
    p =  
  1. 2x + 5 = 11
    2x = 
    x = 
  2. 4x + 1 = 13
     = 
    x = 
  3. 3x + 6 = 42
     = 
    x = 
  1. 3y – 4 = 17
    3y = 
    y = 
  2. 5y – 1 = 14
     = 
    y = 
  3. 4y – 3 = 21
     = 
    y = 

Eq: x   = 
 = 
x = 

Answer. He have  tray of eggs.

Eq:     = 
p = 
p = 

Answer. Sabina have  pawpaws.

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Algebra