Mr. Johanssen gives his class 50-question multiple-choice tests. Each correct answer
worth 2 points, while a half point is deducted for each incorrect answer. If the student does
not answer a question, that question does not get any points.

A student needs to earn 80 points on the test in order to keep an A grade for the
semester. Write an equation in standard form that represents the situation. Identify
3 combinations of correct and incorrect answers that satisfy the equation.