Question 88288
3x + y = –1
9x + 3y = –3



Multiply both sides of the first equation by -3 to eliminate the y terms.
-3*(3x + y) = (-3)*–1
9x + 3y = –3


-9x -3 y = 3
9x + 3y = –3


When you add the equations together you get 0=0, which is ALWAYS TRUE.  Any time you get 0=0, it means that the equations actually represent the SAME LINE.  The entire line is the solution.


R^2