Solution:

Analysis:
We know the total of pieces of pies sold: 88. In this case, we need to express the equation in the function of x. So, X would be the number of pies sold.
As we sold 88 pieces of pieces, we can equal 8x+16. 8x would be the number of pieces of pies made by The Cooking Club. And 16 would be the pieces contributed by the cafeteria. It's 16 because the cafeteria contributed two pies and each pie was cut into eight pieces.