SOLUTION: I don't understand how to solve a system by substitution... Example: v = u - 5 v = 3u + 7 How do I do it?

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Question 16368: I don't understand how to solve a system by substitution...
Example: v = u - 5
v = 3u + 7
How do I do it?
Answer by kikerkins(17) About Me  (Show Source):
You can put this solution on YOUR website!
U-5=3U+7
U=3U+12
-2U=12
U=-6
V=3(-6) +7
V=-11