Question 23281
When you add the two equations together:


2x+3y=4 
-2x-3y=-4


you get 0=0, which it ALWAYS TRUE.  This means that these two equations are actually the SAME LINE.  Some textbooks write this as "the set of all values of (x,y) such that 2x +3y = 4."  In set notation:  { (x,y)| 2x+3y = 4 }.


R*2 at SCC