how do you know if they are eaither parallel or perpendicular
6x+3y=12
2x+2y=4
put in the form y = m x + b
then m is the slope
3 y = -6 x + 12
2 y = -2 x + 4
y = -2 x + 4
y = -1 x + 2
-2 is not - 1 so not parallel
-2 is not -1/-1 so not perpendicular