**Video Transcript**

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Transcript
**Variables **

Sarah is kicking Eric`s butt at a card game. The goal of the game is to make a straight with five cards.

Sarah draws another card. She got lucky, it's a wildcard. Let's have a look at her hand. Sarah has a good hand. She already has a two, three, four, and five. And with the wildcard she's the winner! The wildcard can represent the one card or it can also represent the six card. A wildcard can take on the **value** of any card in the deck.

### Variables in Algebra

In **Algebra**, there is a concept that is similar to the wildcard. **Variables are letters or other symbols used to represent unknown numbers in algebraic equations and expressions.
** We can say:

**A variable is a letter or symbol that represents a quantity that can vary.**For example x, y or a or whatever you choose. A variable can represent an

**unknown number**in an equation. In this example subtraction equation, the variable, x, is equal to two.

### Using Variables in Algebraic Expressions

Let's see how variables can be used in algebraic expressions.

Imagine you have a smartphone contract. The monthly charge for your cell phone is the fixed, monthly cost plus fifteen dollars per gigabyte of data. The **variable x** is equal to the number of gigabytes. You can write this as an **algebraic expression**: 25$ + 15$ · x. With this expression, you can calculate your monthly charge depending on what data plan you need.

Who is the mystery person with whom Sarah keeps texting?

## 8 comments

honestly what even is this

this video reminds me of a low-budget anime

heheh Please, don't do that! We're always looking for new ways to explain math using stories. I hope you'll keep coming back to see what we've done...and hopefully, you'll learn something new!

This is a wonderful video! I almost wish I could forget what I learned to learn it again!

Thank you for your kind comments! We're working hard to continue to bring you videos with easy-to-understand explanations...and fun stories!

Good video!

very good ending :)

Love this! Thank you!