#### Linear Equation in one variable means

- Only one variable
- An = sign
- highest power 1

Let’s take some examples

**
x + 1 = 0
**

Here,

- There is only 1 variable − x
- There is an equal sign
- Highest power of x is 1 (x^1=x)

∴ It is linear equation in in one variable

**
2x + 3 = 0
**

Here,

- There is only 1 variable - x
- There is an equal sign
- Highest power of x is 1 (x^1=x)

∴ It is linear equation in in one variable

**
4x
**
**
+
**
**
5
**
**
=
**
**
108
**

Here,

- There is only 1 variable - x
- There is an equal sign
- Highest power of x is 1 (x^1=x)

∴ It is linear equation in in one variable

**
3x
**

There is no equal sign

∴ It is not a linear equation in one variable

**
4x
^{
2
}
+ 1 = 0
**

Highest power of x = 2

∴ It is not a linear equation in one variable

**
3x + 2y = 3
**

Here, we have two variables x & y

∴ It is not a linear equation in one variable