Verified answer

parallel lines have the same slope as the "original" just a different "b"

perpendicular lines have opposite reciprocal slope (change the sign and flip the number over) to the original, and a different "b"

so...

1. y=-8x + 3

2. y=-8x - 9

3. y=-6x +1

4. y=(1/4)x (you'd need a point to figure out the b)

5. y=.5x

6. y=(1/6)x

In the form

y = mx + b

m = slope

Any two equations with the same slope are parallel

A line is perpendicular when (m) in one equation equals (-1 / m) in the other.

example

-8x + 1 and -8x + 10

are parallel because -8 = -8

-8x + 1 and 1/8 * x + 15

are perpendicular because -8 and 1/8 are opposite signs and inverse of the other..