# Solving For a Variable and Working with Formulas

### Popular Tutorials in Solving For a Variable and Working with Formulas

#### How Do You Solve a Formula For a Variable?

So you're working on a math problem and you have the correct formula. Great! But the variable you need to solve for is not by itself in the formula. Not so great. Don't worry! In this tutorial, you'll learn how to solve a formula for the variable you want!

#### What is a Literal Equation?

A literal equation is an equation where variables represent known values. Literal equations allow use to represent things like distance, time, interest, and slope as variables in an equation. Using variables instead of words is a real time-saver! Learn about literal equations with this tutorial.

#### How Do You Solve for a Variable in Terms of Another Variable?

Got an equation with two variables? Want to solve for one variable in terms of the other? Want to go the other way around? See how in this tutorial!

#### How Do You Find the Length of a Rectangle if You Know its Width and Area?

How do you find the length of a rectangle if you're given the width and the area? This tutorial shows you how!

#### How Do You Use the Solution from an Equation to Evaluate an Expression?

If 3x=21, what is 9x? To get the answer, solve the equation for the variable. Then plug that variable value into the expression and simplify to get the answer. Follow this same process anytime you need to use an equation to evaluate an expression. Watch this tutorial to see this process in action!

#### How Do You Use the Formula for Simple Interest?

If you already have a bank account or if you plan to have one in the future, then this tutorial is a must see! Follow along as this tutorial goes through a word problem involving simple interest.

#### What is the Formula for Simple Interest?

Interest is found in a bunch of places: savings accounts, mortgages, loans, investments, credit cards, and more! Watch this tutorial and learn how to calculate simple interest!

#### How Do You Solve a More Complicated Interest Problem?

Looking into investments? Are you already investing? Then this tutorial is a must see! Follow along as this tutorial goes through a word problem involving simple interest.

#### How Do You Figure Out the Time Traveled if You Know the Distance and Speed?

This tutorial provides a great real world application of math. You'll see how to use uniform motion to figure out how long it will take to go a certain distance traveling at a constant speed. Check it out!

#### What's the Formula Connecting Distance, Speed, and Time?

When you have constant speed, the same formula pops up over and over again, and that's the formula that connects distance, speed, and time. Make sure you know this formula, and if you want a refresher, check out the tutorial!

#### How Do You Solve an Opposite-Direction Travel Problem?

Two people leave a location at different times and travel in opposite directions. What time will they be a certain distance apart? This tutorial takes you step-by-step through this classic word problem!

#### How Do You Figure Out the Rate Traveled if You Know the Distance and Time?

This tutorial provides a great real world application of math! Follow along with this tutorial to figure out how fast you need to go to travel a certain distance in a certain amount of time.