**What is a system of equations? **It is a collection of two or more equations with the same solution (common point) to both equations. The solution to a system of equations is the common solution (common point) to both equations.

**When do we use a system of equations? **Typically, it used when there is more than one unknown quantity and you want a specific amount for each quantity.

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2.3.1a Solve system of equations by graphing

- Explanation:
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**2.3.1b Determine if a point is a solution to a given system of equation**

- Explanation:
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**2.3.1c Solve system of equations by substitution**