well I think your slope is -2/1x - 6...
if you slide everything but the Y over by added the opposite to each side you get
4Y = -24 -8x
then divide it everything by 4...
Y = -6 - 2x
now lets put it in a form we are used to...
Y= -2/1x - 6
so rise over run so start at -6 Y then go down two left 1 to the end of the graph then the opposite to the opposite end of the graph from -6 y