SOLUTION: -4x=y=6 -5x-y=21 How do I solve this using a substitution, combination or equivalent properties? I've have a dozen of these problems and I don't know where to start. Thanks.

Algebra ->  Algebra  -> Systems-of-equations -> SOLUTION: -4x=y=6 -5x-y=21 How do I solve this using a substitution, combination or equivalent properties? I've have a dozen of these problems and I don't know where to start. Thanks.      Log On

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Question 144656: -4x=y=6
-5x-y=21
How do I solve this using a substitution, combination or equivalent properties? I've have a dozen of these problems and I don't know where to start. Thanks.
Answer by checkley77(12569) About Me  (Show Source):
You can put this solution on YOUR website!
-4x=y=6 ONE TOO MANY = SIGNS. CORRECT & RESUBMIT.
-5x-y=21