I am pretty upset with #31. The question asked students to "solve a system of equations for y."
There are two ways to interpret this question: (1) Solve the system of equations or (2) solve both equations for y.
Neither interpretation fits the language particularly well. If (1), the solution for a system of equations HAS to be an (x,y) pair. Why only ask for the y-value? If (2) why call that solving a system of equations, and why ask to solve two equations for y?
In the end, the Regents was going for (1). But lots of my students interpreted the question as (2), and solved both equations for y. I'm not sure what the purpose of using this odd language was, and I think that it hurt a lot of my students.