SOLUTION: What multiplier should be used for each of the following equations to eliminate one unknown by subtraction? 3x- y=7 2x+7y=42

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Question 258069: What multiplier should be used for each of the following equations to eliminate one unknown by subtraction?
3x- y=7
2x+7y=42
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
multiply the first by 7 so you can add them.
multiply by -7 to subtract them
multiply the first by 2 and the second by 3 to subtract