1. Solving Systems of Equations by Multiplying First - Elimination
November 2, 2011
Today is a B day!

2. Warm-up:
Evaluate using Elimination
4x - 9y = -21
4x + 3y = -9

4. Creating Equivalent Equations:
5x + 2y = 16
3x - 4y = 20
In a linear system like the one below, neither variables can be eliminated. For these systems, you will have to multiply one or both equations by a constant so that adding or subtracting eliminates a variable.

5. Example 1:
6x + 5y = 19
2x + 3y = 5

6. Example 2:
2x - 9y = 1
7x - 12y = 23

7. Example 3:
Darlene is making a quilt that has alternating stripes of regular quilting fabric and sateen fabric. She spends $76 on a total of 16 yards of the two fabrics at a fabric store. Write a system of equations that can be used to find the amount x (in yards) of regular quilting fabric and the amount y (in yards) of sateen fabric she purchased. The cost of Sateen fabric is $6 per yard and the cost of quilting fabric is $4 per yard.

8. Pgs
Guided Practice 1-4