Question

what are variable why used variable​

Answer 1

symbol for a number we don't know yet. It is usually a letter like x or y.

Example: in x + 2 = 6, x is the variable.

Why "variable" when it may have just one value? In the case of x + 2 = 6 we can solve it to find that x = 4. But in something like y = x + 2 (a linear equation) x can have many values. In general it is much easier to always call it a variable even though in some cases it is a single value.

Answer 2

Answer:

Variables is the quantity that may change within the context of a mathematical problem or experiment. Typically we use single letter to represent a variable.

x,y and z are most common among them.

When we need the find an unknown quantity we use some alphabet which we call as variables.

For example: 2x +3=25 x=11

here 'x' is a variable

Hope it helps you!

@PrettyNancy