**Algebra-**writing mathematical phrases using letters to represent numbers.

**Variable-**a letter that represents a number in an equation or expression.

**Expression-**a pattern which has many possible answers. ex. 2x

**Equation-**Only has one possible answer. ex. 2x=6

**Constant-**The integer in an algebraic expression or equation

*One Step Equations*1. Isolate the variable

2. Cancel using the opposite operation

- make a zero pair with the constant

3. Balance the equation

4. Verify

**Two Step Equations**

1. Isolate

2. Cancel constant

3. Balance

4. Simplify variable

5. Balance

6. Verify

**Multiplication:**

2x + 1 = 5

2x + 1 - 1 = 5 - 1

2x/2 = 4/2

x = 2

2x + 1 = 5

2(2) + 1 = 5

4 + 1 = 5

5 = 5

*Inspection:*

x/2 + 5 = 9

x/2 + 5 - 5 = 9 - 5

2x/2 = 4(2)

x = 8

*Verify:*

x/2 + 5 = 9

8/2 + 5 = 9

4 + 5 = 9

9 = 9

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