Definitions

1. open sentences - equations or inequalities that contain variables and cannot be answered true or false.
   • 2x – 3 = 5 cannot be answered true or false until a value is given for x.


2. equation - is formed when an "equal to" symbol is placed between two expressions.
   • is means =


3. inequality - looks like an equation except there is an inequality symbol between two expressions.
   • > represents is "greater than"
   • < represents is "less than"
   • ≥ represents is "greater than or equal to"
   • ≤ represents is "less than or equal to"


4. solution – is a number that replaces the variable and makes the open sentence true.