Question

Are the graphs of the lines in the pair parallel? Explain.

y = 5x + 6
–18x + 3y = –54

Answer 1

You'd want to solve for the second one to get the slope. Although there is a way of doing it with ax + by = c, I forgot it.
So 18x + 54 = 3y
6x + 18 = Y

They are not parallel, since they have different slopes.

Answer 2

I think it's as simple as -b/a?

Answer 3

Refer to the attachment.