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 247145: 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 checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
3x-y=7 multiply this equation by 7 & add.
2x+7y=42
21x-7y=49
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23x=91