SOLUTION: ONE NUMBER IS 3 MORE THAN ANOTHER. TWICE THE LARGER NUMBER MINUS THE SMALLER NUMBER IS 15. WHAT ARE THE TWO NUMBERS?

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Question 326045: ONE NUMBER IS 3 MORE THAN ANOTHER. TWICE THE LARGER NUMBER MINUS THE SMALLER NUMBER IS 15. WHAT ARE THE TWO NUMBERS?
Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
let the bigger number be x
the smaller be y
x-y=3
..
2x-y=15
subtract one from the other to eliminate y
x-y-2x+y=3-15
-x=-12
x=12
..
Plug the value of x in the equation x-y=3
12-y=3
y=9