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Solve the system of equations

  3x−y=6

  6x+y=21

 Oct 15, 2019
 #1
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   3x  −y = 6

   6x + y = 21                add these equations

 

9x    =    27               divide both sides by 9

 

x  =   3

 

Using either equation to find y

 

3(3) - y  = 6

 

9 -  y  =    6         add y to bothsides, subtract 6 from both sides

 

3   =   y

 

So  (x, y)   = (3, 3)

 

 

cool cool cool

 Oct 15, 2019

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