Question

What is a variable?where it is used?

Answer 1

A variable is a quantity that may change within the context of a mathematical problem or experiment. Typically, we use a single letter to represent a variable. The letters x, y, and z are common generic symbols used for variables. Sometimes, we will choose a letter that reminds us of the quantity it represents, such as t for time, v for voltage, or b for bacteria.

Variables are used in many areas where the value is unknown.
Example: in x + 2 = 6,
x is the variable.