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=__Cramer's Rule  __ = 

**__Objective: __** Students will learn the correct way to solve a problem using a method called "Cramer's Rule."   So, by defenition in the dictionary, Cramer's Rule is defined as: a method involving the determinant of the coefficients, for calculating a unique solution for a given system of linear equations. Sound confusing enough yet? Well let's see if we can make it seem a little bit easier to understand. Crammer's Rule uses determinants to solve systems of equations.

**__Determinants: __** What is a determinant you may ask? Well, a determinant is a square array of numbers or variables enclosed between two parallel lines. To find the answer to a determinant, you must multiply in an X and subract the two answers that you get. For example: to solve this, we multiply in an X format and subract our two answers. 3(5)-2(-1) 15-(-2)=17 the answer to this determinant is 17  **Now that we know how to solve a determinant, we can learn how to solve a system of equations using Cramer's Rule.**

__**Videos!**__ 

(Now, here's how to solve a 2x2 linear system.) <span style="color: #00ff00; display: block; font-family: 'Comic Sans MS',cursive; font-size: 90%; text-align: center;"> media type="youtube" key="PO4hpSyxH9g" height="315" width="500" <span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> <span style="color: #ff00ff; display: block; font-family: 'Comic Sans MS',cursive; font-size: 90%; text-align: center;">(Now, here is how to solve a 3x3 linear system.) <span style="display: block; font-family: 'Comic Sans MS',cursive; text-align: center;"> media type="youtube" key="taBHTo8sviM" height="364" width="445" <span style="color: #008080; display: block; font-family: 'Comic Sans MS',cursive; font-size: 120%; text-align: center;">**Now that we have somewhat of an undertanding on how to use Crammer's Rule, lets do some sample problems from the link on the left.**