Question 124679: the difference of two numbers is 7. The second is 4 less than 2 times the first.What are the two numbers?
Answer by solver91311(24713)   (Show Source):
You can put this solution on YOUR website! Two numbers, so one of them is x and the other is y.
Their difference is 7, so 
The second, y, is, meaning equals, 4 less than two times the first. 2 times the first is  , 4 less than that is  , so  , or in standard form, 
Multiply the first equation by -1:
Then add the second equation to it
Substitute into the first equation:
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