19 - Solving Systems of Equations by Addition, Part 1 

Best of luck to your endeavors! I hope you succeed! :)

Well done! We always should keep up with the times. Moreover, what you are doing now, David, is one of the forms of future education.

on tests they will specifically ask you to use a certain method for the question to show that you know both

@@dwydeshruyde1409 Yup, I had to use this trick ( ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-Ks-wwYpS20Y.html ) and then reverse engineer it to fit the certain method they were asking for. But that was before I found this channel Math and Science.

It's just a mistake.

Remember adding a negative u get a bigger negative -2 adding -42 gives u a bigger negative that's were he got negative -44

He lined up the numbers kind of weird but -42+-2=-44 so he is still correct

You need to be at level 5, this is rocket science for you: one baby steps at a time Caraloo.

he has other videos solving with baby steps and very detailed explanations... you should look for it yourself, he is an amazing teacher you just have to find the right videos for your level