Assignment: Simple and Compound Interest, Algebra 2 A farmer plants corn in the middle of a drought. After the plants start to grow, 8% of the plants die each week due to lack of water. By the end of 20 weeks, there are 2.45 acres of corn still alive. About how many acres of corn did the
farmer originally plant?

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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.