SOLUTION: I'm having trouble with this.....Thank you... What multiplier should be used for each of the following equations to eliminate one unknown by subtraction?

SOLUTION: I'm having trouble with this.....Thank you... What multiplier should be used for each of the following equations to eliminate one unknown by subtraction?

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Question 130051: I'm having trouble with this.....Thank you...
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 checkley71(8403) (Show Source): You can put this solution on YOUR website!
MULTIPLYING THE FIRST EQUATION BY -7 ALLOWS YOU TO SUBTRACT THESE 2 EQUQTIONS.
OR YOU CAN MULTIPLY THE FIRST EQUATION BY 2 & THE SECOND ONE BY 3 & SUBTRACT.
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