48 out of 100 private buses usually run on time. out of the buses that are on time, only 36 are owned by jerry. out of the remaining 52 buses that usually run late, only 7 are owned by jerry. what is the probability that a bus is owned by jerry, given that it runs on time?

The answer would be c.8(2)=16-16=0 -8(2)=16-16=0

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.