Presentation is loading. Please wait.

Presentation is loading. Please wait.

7.4. 5x + 2y = 16 5x + 2y = 16 3x – 4y = 20 3x – 4y = 20 In this linear system neither variable can be eliminated by adding the equations. In this linear.

Similar presentations


Presentation on theme: "7.4. 5x + 2y = 16 5x + 2y = 16 3x – 4y = 20 3x – 4y = 20 In this linear system neither variable can be eliminated by adding the equations. In this linear."— Presentation transcript:

1 7.4

2 5x + 2y = 16 5x + 2y = 16 3x – 4y = 20 3x – 4y = 20 In this linear system neither variable can be eliminated by adding the equations. In this linear system neither variable can be eliminated by adding the equations. For systems like this you can multiply one or both equations by a constant so adding will result in elimination. For systems like this you can multiply one or both equations by a constant so adding will result in elimination.

3 Step P: Multiply one or both equations. Step 1: Add the equations. Step 2: Solve for variable. Step 3: Substitute into either equation and solve for other variable. 5x + 2y = 16 3x – 4y = 20 2( )10x + 4y = 32 3x – 4y = 20 13x = 52 13 X = 4 3(4) – 4y = 20 12 – 4y = 20 -4y = 8 Y = -2 (4,-2) 5x + 2y = 16 3x – 4y = 20

4 Step P: Multiply one or both equations. Step 1: Add the equations. Step 2: Solve for variable. Step 3: Substitute into either equation and solve for other variable. 2x – 9y = 1 7x – 12y = 23 -4( ) 3( ) -8x + 36y = -4 21x - 36y = 69 13x = 65 13 X = 5 2(5) – 9y = 1 10 – 9y = 1 -9y = -9 Y = 1 (5,1) 2x – 9y = 1 7x – 12y = 23

5 6x – 2y = 1 -2x + 3 = -5 2x + 5y = 3 3x + 10y = -3 3x – 7y = 5 9y = 5x + 5


Download ppt "7.4. 5x + 2y = 16 5x + 2y = 16 3x – 4y = 20 3x – 4y = 20 In this linear system neither variable can be eliminated by adding the equations. In this linear."

Similar presentations


Ads by Google