1. Chapter Four Vocabulary

2. Algebraic Expression
An expression is a combination of individual terms separated by plus or minus signs and includes a variable. It does not have an “equals” sign.
Example:

3. Equivalent Expressions
Two expressions are equivalent if they have the same value.
Example: 2 + 3 is equivalent to  

4. Equivalent Ratios
If two ratios have the same value when simplified, then they are called Equivalent Ratios. Example: 18:24 = 15:20 = 3:4 when simplified

5. Evaluate
To find the numerical value of.  Substitute the value(s) given for the variable(s) and perform the operations according to the order of operations.
Example: 2x + y − 10
when  x = 4 and y = 3 

6. Reduce
To put a fraction into simplest form.
Example:

7. Enlarge
To make bigger, expand.

8. Equivalent Fractions
Two fractions are equivalent if they have the same numerical value. Example: 𝟑 𝟔 and 𝟓 𝟏𝟎

9. Expression
A mathematical phrase that combines numbers (1,2…) and/or variables (y,z,x…) using operations (+ - x ÷).
Example: 4 + (5 − 3)

10. Ratio
Compares two quantities by division. Example:

11. Similar Figures
When two figures have the same shape and the ratios of the lengths of their corresponding sides are equal.
Example:

12. Substitution
Replacing one symbol with a number, a variable, or another algebraic expression of the same value.
Example: 13x − 6 when x = 4.
13 (4) - 6

13. Vertex (Plural:Vertices)
The point at which two line segments meet to form a "corner." 

14. Variable
A symbol used to represent one or more numbers. Example: 3x – (8xy + z) x, y, z = variables