SOLUTION: what multiplier should be used for each of the following equations to eliminate one unknown by subtraction? 3x-y=7, 2x+7y=42. A.)7 for the first equation, 1 for the second B.

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. A.)7 for the first equation, 1 for the second B.      Log On


   

Question 347021: what multiplier should be used for each of the following equations to eliminate one unknown by subtraction? 3x-y=7, 2x+7y=42.
A.)7 for the first equation, 1 for the second
B.)6 for the first equation, 7 for the second
C.)3 for the first equation, 2 for the second
D.)2 for the first equation, 3 for the second
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
D)
6x-2y=14
6x+21y=42
---------subtract
-23y=-28
.
Ed