1. SOLVING LINEAR EQUATIONS

2. Primary School:
Fill in the box:
+ 4 = 6
Now:
Find the value for x if:
x + 4 = 6

3. x 1 1 1
X = 3

4. 1 1
x 1 1 1 1
X + 1 = 5 Whatever you do to an
equation, do the same
X + 1–1 = 5–1 thing to both sides of
the equation.
X = 4

5. 1 1
x x 1 1 1 1
2X = 6
X = 3

6. 1 1
x x 1 1 1 1 1 1
2X + 2 = 6
2X + 2 – 2 = 6 – 2
2X = 4
X = 2

7. 1 1
x x 1 x 1 1
2X + 1 = X + 4
2X + 1 – 1 = X + 4 –1
2X = X + 3
2X – X = X + 3 – X
X = 3