graphical form: 9*x +6*y=-6 simplifies to 9*x+6*y+6=0
text form: 9*x+6*y=-6 simplifies to 9*x+6*y+6=0
so 9*x+6*y=-6
9*x*y+6=0
simplify (9*x+6*y=-6)
I hope this helps you
