Hi

solving System by Elimination

8x - 8y = 16

4x + 4y = -72 



8x - 8y = 16

8x + 8y = -144

  16x = -128

    x = -8   and y = -10     |(-72-(-32))/4 = -40/4   |using 2nd Eq



CHECKING our Answer***

  8x - 8y = 16

 -64 + 80 = 16 

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