1. Algebra Revision

2. Note 1: Substitution
Substitution means replacing a symbol with a value. Remember to follow the rules of BEDMAS.
Examples: Calculate the value of these expressions
7x – 1 when x = 2
7  2 – 1 = 14 – 1
= 13

3. when f = 2 and g = 6
= 4
5x2 - 3x + 2 when x = -3
5  (-3)2 - 3 
= 56

4. Note 2: Solving Equations
To solve equations you must:
Get the unknown to one side of the equal sign by itself
Do the same operation to both sides of the equation
Start each step on a new line with all the equals signs lined up
In an equation with more than one operation, the opposite operations must be applied in reverse order

5. Examples: Solve = 7 6x + 5 = 17 - 3 = 9 6x = 17 - 5 x + 3 = 7 x 2
Examples: Solve
= 7
6x + 5 = 17
- 3 = 9
6x =
x + 3 = 7 x 2
= 9 + 3
6x = 12
x + 3 = 14
x = 2
x =
= 12
x = 11
x = 12 x 5
x = 60

6. Worksheets:
Substitution
Solving Eqns