Learning Objectives:

__Introduction to Linear Equations in One Variable__

**Types of Linear Equations:**

**1.** **Conditional Equation** is an **equation** that is only true for a specific value of the variable, which is the solution.

If the **conditional equation** is not **linear**, it is possible to have more than one solution.

**2. Identity** is an **equation** that is always true and has infinite solutions.

**3. Contradiction **is an **equation** that is always false and has no solution. We can also say that the **equation** is inconsistent.

__Difference between an expression and an equation__** :**

An **Expression** is a mathematical phrase that combines numbers and/or variables using mathematical operations.

An **Expression** can be evaluated but not solved, and therefore expressions do not contain equal signs.

An **Equation** is a mathematical sentence that combines numbers and/or variables, that shows the equality of two expressions.

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**Hook Questions**

*1. **What is the difference between an expression and equation?*

*2. **What is Contradiction?*

*3. **What is meant by Conditional Equation?*

*4. **What is an Identity?*

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