Practice Final #7 Solution (by both transpose & projection)
I figured since David provided us with another way to solve number 7 using a transpose of a matrix, I decided to solve the problem using this method as well as the typical projection method to make sure they match. Looking at other students' work for 7, a few factored out the denominator completely... so here's a version not factored. The first one is with the transpose method, second link is using the projection. Let me know if anything's hard to understand!