This is a collection of Algebra 1 tutorials and video lessons from the YouTube channel "Kate's Math Lessons".

## Collection Contents

### Video Lesson: What Is A Function?

by Lani deGuia

What is a function? How do you use the vertical line test? Learn more about functions and determine if mappings, sets of ordered pairs, tables, or graphs are functions in this short algebra video.
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by Lani deGuia

Need help factoring quadratics? This algebra lesson shows how to factor a quadratic with a leading coefficient that\'s not 1. See the rest of the lesson on factoring at katesmathlessons.com
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### Video Lesson: Math Help-Factoring Quadratics

by Lani deGuia

How do you factor a quadratic expression? Check out this short video to learn how to set it up and test your answer to see if you\'re correct. Learn how to determine the correct signs to use, identify factors of the constant term in x^2 + bx + c and use FOIL to check different combinations.
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### Video Lesson: Math Help-How To Use The Quadratic Formula

by Lani deGuia

This math lesson shows how to use the quadratic formula to solve a quadratic equation that is not in standard form.
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### Video Lesson: Solving a System of Equations Using Elimination With Multiplication

by Lani deGuia

Learn how to solve a system of equations using the elimination method. Need more help? Check out a more detailed lesson on elimination at katesmathlessons.com
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### Video Lesson: Math Help-Solve A System Using Substitution

by Lani deGuia

Need help solving a system of linear equations? This video explains how to use the substitution method and also shows how to check your answer once you\'re done.
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### Video Lesson: Math Help-Solving A System of Equations Using Elimination

by Lani deGuia

Learn how to solve a system of linear equations using the elimination method
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