Colt's Algebra 2 Page
| y = 2x and x + y =12 (4,8) | This is a substitution problem. First you substitute the 2x form the first problem into the second problem and you get 3x =12.now you divide everything by 3 and x = 4. now you plug the 4 into the second problem and get 4+y =12 Therefore y = 8 |
| 5x-2y = 4 and 3x + y = 9 (2,3) | This is a linear combination equation. First you multiply the second equation by two so that the y's will cancel.Once the y's cancel you get 11x = 22 therefore x =2 . Now you plug the 2 into the first problem and get 10- 2y = 4 which makes y = 3 . |
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