text: i dont get it.................. substitution method? substitution method y=2x-5 4x-y=7 see it's easy  all u have to do is pick one of ur two equations , u can pick anyone which looks simplar to you,and move variables in sucha way that all x variabl are on one side and y on the other.  will pick the first equation y=2x-5(it is already simplified as y is on one side of equality and the rest if the term is on the other side) now u have the value of y in terms of x put this value in the other equation in places of y  you will get 4x-(2x-5)=7 or 2x+5=7 or2x=2 or x=1 now u have the value of x  to find the value of y substitute all x by 1 in either of ur equations i m substituting in eq1 y=2(1)-5 y= -3  hence ur sol is x=1 y= -3