SOLUTION: 2x-5y=12 2y-x=7 According to the system of equations above, what is the value of x-3y?

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Question 1087063: 2x-5y=12
2y-x=7
According to the system of equations above, what is the value of x-3y?
Answer by ikleyn(52783) About Me  (Show Source):
You can put this solution on YOUR website!
.
Add the two given equations (both sides), and you will get

x - 3y = 19.

Answer.  x - 3y = 19.

The lesson to learn from this solution: 

    You don't need to solve the system to get the answer.