Rick puts $6500 in a high interest money market account at 4.36% annual interest
compounded monthly. Assuming he makes no deposit or withdrawals, how long will it
take for his investment to grow to $7000?
A. 2 years
B. 7.1 years
C. 1.6 years
D. 1.7 years
E. None of them

It is e) i am not sure if you have any questions or need any

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.