# Solving a System of Equations by Substitution - part 1

Taught by YourMathGal
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Lesson Summary:

In this lesson, you will learn how to solve a system of equations by substitution method as demonstrated with two examples. If one of the equations is solved for x or y, that value can be substituted into the other equation to create an equation with one variable. The first example shows how to solve a system of equations with y already solved for. In the second example, the instructor explains how to select the easiest variable to solve for by identifying which one has a coefficient of one or negative one.

Lesson Description:

This is part 1 of how to solve a system of equations using the substitution method. The first system solved is 2x - y = -5 and y = x + 4. The second system solved is 3x + y = -14 and 4x + 3y = -22.

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