Hi

Let x and y represent the number of catfish and blue gills respectively 

Question states***

 x + y = 75

3x + 2y = 175

Solving for x by sustitution:  y = 75-x

 3x + 2(75-x) = 175

          x = 25, the number of catfish.  50 the number of bluegills  (75-25)

CHECKING our Answer***

 3*25 + 2*50 = 175 

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