7 3elimination

Part Three – Solving equations by Elimination Holt Algebra I Text pages 330-334

Solve using substitution after manipulating equations in standard form. ,[object Object],[object Object],[object Object],[object Object]

Let’s solve by elimination. ,[object Object],[object Object],[object Object],[object Object]

2x + 3y = 21 -3x – 3y = -12 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The steps and explanations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

2x + 3y = 21 -3x – 3y = -12 You may insert (x= -9) into either one. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Try One. ,[object Object],[object Object]

Eliminate the x values. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

4x = 21 / 9 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ready to go one more step? ,[object Object],[object Object],11x + 2y = -8 8x + 3y = 5

Let’s try 11x + 2y = -8 and 8x + 3y = 5 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Multiply both sides ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Results of the First Steps ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

From previous slide -17x = 34 x = -2 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

One more for practice ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

One more for practice - Solution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Which way of solving works best for you? ,[object Object],[object Object],[object Object],[object Object]

Assignment: 334:15-33 & 41-47 odds

7 3elimination

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