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

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: What multiplier should be used for each of the following equations to eliminate one unknown by subtraction? 3x-y = 7 2x+7y = 42      Log On


   

Question 126300: 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) About Me  (Show Source):
You can put this solution on YOUR website!
7(3x-y=7) will eliminate the y variable when added to the other equation-thus:
21x-7y=49
2x+7y=42
--------------------
23x=91