Determine whether each pair of lines is parallel, perpendicular or neither.

6. the line containing points x(8, -3) and y(-4, -6).

the line containing points r(1, 4) and s(-3, -3).

7. the line containing points a(2, -1) and b(3,-4).

the line containing points c(1,6) and d(3, 0).

8. y= 2x + 1
2y = -x-1

9. 4x - y = 2
8x - 2y = -6