AIMS Math Test Preparation - MathHelp.com - By MathHelp.com
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| 00:0-1 | The following is a selected video from your teacher.com where | |
| 00:03 | you can browse over 450 complete math lessons with example | |
| 00:07 | videos , interactive practice problems , self tests and more | |
| 00:11 | . Try a complete lesson today at your teacher dot | |
| 00:14 | com to solve this system of equations . By addition | |
| 00:22 | , our first goal is to cancel out one of | |
| 00:26 | the variables by adding the two equations together . Notice | |
| 00:32 | that if we add these two equations together , R | |
| 00:37 | plus y and minus Y will cancel out on the | |
| 00:43 | left . Three X plus seven X . Is 10 | |
| 00:47 | X . And on the right , five plus 15 | |
| 00:52 | is 20 Dividing both sides by 10 X equals two | |
| 01:03 | . To find why simply plug a two back in | |
| 01:08 | for X in either one of the two given equations | |
| 01:13 | . So let's go with our first equation . Three | |
| 01:16 | X plus Y equals five . If we plug it | |
| 01:20 | to back in for X , that gives us three | |
| 01:28 | times two plus why equals five . This simplifies to | |
| 01:37 | six plus Y equals five . And subtracting six from | |
| 01:42 | both sides gives us Why equals negative one , So | |
| 01:49 | x equals two and Y equals negative one . And | |
| 01:55 | put your answer in the form of the ordered pair | |
| 01:59 | , two negative one . |
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