Use the exponential decay model, Upper A equals Upper A 0 e Superscript kt, to solve the following. The half-life of a certain substance is 21 years. How long will it take for a sample of this substance to decay to 63% of its original amount? It will take approximately nothing ▼ percent percent per year years for the sample of the substance to decay to 63% of its original amoun

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.