SOLUTION: Solve by the substitution method. What is the solution to the system? x-y=3 7x+3y=-19

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Question 1181671: Solve by the substitution method. What is the solution to the system?
x-y=3
7x+3y=-19
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
the top is also x=y+3
so the second is 7(y+3)+3y=-19
7y+21+3y=-19
10y=-40
y=-4
x=-1
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check in second -7-12=-19