SOLUTION: x+y=7 and 2x-y=2 then y=? 2x+y=4 and 3x-2y=13 then x=?

Algebra ->  Coordinate Systems and Linear Equations -> SOLUTION: x+y=7 and 2x-y=2 then y=? 2x+y=4 and 3x-2y=13 then x=?       Log On


   

Question 616306: x+y=7 and 2x-y=2 then y=?
2x+y=4 and 3x-2y=13 then x=?

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

Solution to the following system:

 x+y=7  

2x-y=2 

 3x = 9, x = 3 and y = 4



2x+y=4 and ||||multiplying 1st EQ thru by 2 to  eliminate the y variable

3x-2y=13

4x+2y=8 and ||||Result of multiplying 1st EQ thru by 2 to  eliminate the y variable

3x-2y=13    

  7x = 21, x = 3  and y = -2   (2x+y = 4 or y = 4-2x)