I'm sorry, but I need more information to answer your question.
The equation y = -10x + 216 represents a linear relationship between two variables, where y represents the number of students who drop out and x represents the year. However, I don't have any information about the values of x for previous years or any other data that can be used to make a prediction for the year 2012.
If you have additional information, such as the number of dropouts for previous years, you can substitute those values into the equation and solve for the value of y in 2012.