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The sum of two numbers is 42. One number plus 2 times the other number is 57. What are the numbers?
Lets solve by elimination;
so we will multiply the first equation by -1;
Now we will add that equation to the second;
now plug that into either original equation to find x;
The sum of two numbers is 45. Their difference is 9. What are the numbers?
Since one variable will already be eliminated we will not need to multiply anything;
plug that into either equation for x;