Question

When would you write an x in an equation?)

Answer 1

`\Large \boxed{\mathrm{When \ a \ number \ is \ not \ known}}`

Explanation:

For example, a sum of a number and 6 is 12.

The number is unknown.

Let the number be x.

• x + 6 = 12

We can solve for x (unknown number). Subtract 6 from both sides of the equation.

• x = 6