Which expression represent his total cost?

Which values for a and b will create infinitely many solutions for this system of equations? ax-y=8 2x+y=b

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Mike wants to make meatloaf. his recipe uses a total of 8 pounds of meat. if he uses a 3 to 1 ratio of beef to pork, how much pork will he use? enter your answer as a mixed number in simplest terms.