Aquantity a varies inversely as a quantity b, if, when b changes, a changes in the inverse ratio. what happens to the quantity a if the quantity b doubles? a. quantity a triples c. quantity a stays the same b. quantity a doubles d. quantity a halves select the best answer from the choices provided a b c d

Idon’t know actually is more difficult

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.