Math - Variables

Variable is a symbol that represents a mathematical object.

Consider the expression: $2x + 1$
You can substitute x variable with any mathematical object and then evaluate the result.

Examples

The chef

A chef sells a delicious hamburger for just $2 per unit, if the quantity is greater than or equal to 10 units the price will be $1.5 per unit.

greater than or equal to 10:
$x \times 1.5 = price$

less than 10:
$x \times 2 = price$

The villager house

A wealthy villager wants to sell his house; he's a cool guy and the house's price is equivalent to the buyer's salary.

The formula used to determine the total value:
25% of salary × 48 months = total value of the house