For which system of equations is the graph a pair of parallel lines? A. { y = 2 3 x − 4 y = 5 + 2 3 x B. { y = 7 9 x + 9 y = 9 − 7 9 x C. { y = 1 5 x − 1 y = 5 x − 1 D. { y = 3 4 x + 8 y = 8 − 4 3 x

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?