Determinants and Cramer's Rule - Cool math Algebra Help Lessons - Determinants and Cramer's Rule for Solving 2x2 Systems

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Determinants and Cramer's Rule Lesson 1 - Determinants and Cramer's Rule for 2x2 Systems (page 4 of 5)
---- This algebra lesson introduces 2x2 determinants and explains how to use Cramer's Rule for solving systems of 2 equations and 2 unknowns.

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Now, to get the y part...

Take D again...

and delete the column for the y guys...

| top row: 3 , _ bottom row: -5 , _ | ... column 1 are the x guys and column 2 are the y guys

Replace that column with the "= guys":

Dy = | top row: 3 , 7 bottom row: -5 , -2 |

So, our y part is

y = ( Dy / D ) = ( 29 / 7 )

and our final answer is

. That's it!

YOUR TURN:

Use Cramer's Rule to solve

Continued on the next page

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