Ordered Pairs as Solutions of Linear Equations (Courseware/Exempt)

Today i learned how to put the negitaive and postives against eachother. And replace x or y with a number. and then have the numpers in pranthicees be multiplyed and then you have to minus the Equaled out number by tha answer you get when you multiply the number tha replaces tha x or y in pranthicees.