Question

Why do we use variables, and what is the significance of using them in expressions and equations?

Answer 1

a variablle is the unknows amount

Answer 2

variables are symbols or containers of unknown value or amount that can be used in expressions and equations.
In programming they are used to store values as well

Answer 3

it is helpful to use variables because it lets us create expressions that don't only point to one place. they can show a line, or a circle, or pretty much any shape. variables are important because we don't always know what fits in a spot, and there may be more than one thing that fits in that spot, we don't want to limit ourselves, so we use variables.