You can put this solution on YOUR website! Solve the system by graphing.
3x+y=6
3x-y=0
X.................0..............1...........................5........................
Y=6-3X..........=6-3**0=3.....=6-3*1=3....................=6-3*5=-9.................
Y=3X............=3*0=0........=3*1=3......................=3*5=15
WE SEE THAT THE 2 LINES INTERSECT AT X=1 AND Y=3 WHICH IS THE ANSWER
