Hi

6x = 90 + 3y 

x - 3y = 50



6x -3y = -90

x - 3y = 50

 

6x - 3y = -90

-x + 3y = -50

     5x = -140

      x = -28   and y = (x-50)/3 = -78/3 = -26

Ordered pair (-28,-26) is the solution for this system

CHECKING our Answer***

 6*-28 - 3*-26 = -168 + 78 =  -90 

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