A flashlight shines straight up into the sky, 9 ft to the right of a tent located at the origin. For which values of A, B and C will Ax+By=C represent the beam of light?

Atest consists of 10 multiple choice questions, each with 5 possible answers, one of which is correct. to pass the test a student must get 60% or better on the test. if a student randomly guesses, what is the probability that the student will pass the test?