Expressions and Equations

🔹 What Is It?

An expression is a math phrase with numbers, variables, and operations — but no equal sign.
An equation has an equal sign and shows that two things are the same.

🧩 Clue to Remember

• Expression: math idea
  
  

• Equation: math statement with "="
  
  

🔹 Example

• Expression: 3x + 5
  
  

• Equation: 3x + 5 = 20
  
  

💡 Why It Matters

This is the start of algebra thinking — we use it to model real situations and solve problems with unknowns.