Using Methods to Solve
Equations
3 MAY 2015
Method 1: Inspection
 Look carefully at each part of the equation
 Think about what it does
 2a – 1 = 13
 Taking 1 away from 2a makes it 13, so 2a is 14
 A is half of 14
 So a = 7

COMPLETE NUMBER 7 a, b, c, d, e on page 77
Method 2: Guess and Check
 First guess a solution
 Check if it works by putting it into the equation
 If it does not work, change number and check
again
 X+3=7



I guess 3. 3+3=6, not 7, so I guess a bigger number
I guess 4. 4+3=7 so x=4
COMPLETE NUMBER 8 a, b, c, d, e, f on page 78
Method 3: Strip Diagrams
 Draw a strip diagram
 3x-5=13
 The strip diagram tells us that 3x=18
 So x=6
 COMPLETE NUMBER 10 a, b, c, d, e on page 80
HOMEWORK:
 Pages 83-84
 Questions 14 and 15
 ICT LAB TOMORROW