[3 / 1 / ?] 144KiB, 1024x762, a1a.jpg View SameGoogleImgOpsiqdbSauceNAO Thread Reply Original Report Media View Same Google ImgOps iqdb SauceNAO Download Anonymous Tue 20 Aug 2019 16:35:27 No.704865 View ViewReplyOriginalReport Quoted By: >>704869 I have a passage on my book that says that the equation y' + ay = 0, after saying that k=y', becomes k+a=0. Why did the ay become a?