1. Algebra

2. Algebra is a part of mathematics that uses
letters or symbols to represent changing or
unknown values.

3. Variable
Variable
a letter used to represent a value that can change or vary
in 4x – 1, the letter x is a variable
Identify the variable:
2x 3y -2x2 6a

4. Constant Constant a value that does not change represented by a number
Examples:
Give three other examples of a constant

5. Numerical Coefficient
The number in front of the variable.
If no number is visible it is assumed to be 1.
Examples: 5x has a numerical coefficient of 5
-3y has a numerical coefficient of -3
z has a numerical coefficient of 1.
What is the numerical coefficient of:
2y -63f w -t

6. Expression Expression Numbers and variables, combined by + or - signs
Examples: 2x + 3 two terms
x - y + z three terms
x – y two terms
How many terms are in the following?
3x x – 5t + 2 6d – 7x2 + 3

7. Equation
Equation
A mathematical statement that says that two quantities are equal
Has an equal sign
Examples: 2x + 3 = 7
6 + 2 = 8
5x – 1 = 1

8. Putting it all together
4x + 7 = 11
Expression or equation?
Numerical coefficient
constant
variable

9. Putting it all together
x – 6y
Expression or equation?
Numerical coefficient
variable

10. Putting it all together
8x - 9
Expression or equation?
Numerical coefficient
constant
variable