What is the solution set for this inequality? -8x-40 (greater than) -16
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We need to construct the system of equations in order to solve that problem. Let's denote one-time membership fee with x and monthly fee with y. Then we can write that John paid x+6y=325 and Abigail paid x+9y=475. Solving the system of equations 
, we find that x=25 and y=50. The monthly fee is 50 dollars.