# One variable Problem 3

Taught by YourMathGal
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Lesson Summary:

In this lesson, you will learn how to define two unknown numbers that add up to a given number using algebra and one variable. By using the pattern that the second number will be the given number minus the first number, you can easily define the two unknown numbers. The lesson then goes on to show how to solve a problem where you have to find two numbers that add up to a given number and also satisfy a given equation involving them.

Lesson Description:

Learn how to use algebra and one variable to define more than one unknown quantity, write an equation, solve it, and check it. Shows how to define 2 variables if their sum is a given number.

More free YouTube videos by Julie Harland are organized at http://yourmathgal.com

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• #### Staff Review

• Currently 4.0/5 Stars.
This lesson explains how to write an equation with just one variable in a word problem in which you need to find two numbers that add up to another number. Several examples are used to drive home the idea of finding variable expressions that add up to a number. All steps are explained in the word problem puzzles in this video. This is a very good introduction to solving word riddles.