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- [Instructor] So lets write down a differential equation, the derivative of y with respect to x is equal to four y over x. And what well see in this video is the solution to a differential equation isnt a value or a set of values. Its a function or a set of functions. But before we go about actually trying to solve this or figure out all of the solutions, lets test whether certain equations, certain functions, are solutions to this differential equation. So for example, if I have y is equal to four x, is this a solution to this differential equation? Pause the video and see if you can figure it out. Well to see if this is a solution, what we have to do is figure out the derivative of y with respect to x and see is that truly equal to four times y over x. And Im gonna try to express everything in terms of x to see if I really have an equality there. So first lets figure out the derivative of y with respect to x. Well thats just going to be equal to four. Weve seen that many t