Hi,

solve by substitution 

4=3x-y  OR y = 3x-4

9x=3y+12

9x = 3(3x-4) + 12

  0 = 0  Infinite solutions (graphically, the same line)



solve by elimination 

3x-16=5y

-3x+5y-33=0



 3x-5y=16

-3x+5y=33

    0 ≠ 49  There is NO solution

   

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