After working for 25 years you would like to have $ 700,000 in an annuity for early retirement. If the annual interest rate is 7.5 %, compounded monthly, what will your monthly deposit need to be?
A. $797.94
B. $977.44
C. $1595.88
D. $2426.70

Maybe fx = lxl because of the way the x is positioned is that what he

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.