Linear equations in two variables add. help

Two points are given from each of two lines. Without graphing the points, determine wheather the lines are parallel, perpendicular or neither.

Line 1: (4, -6) (3, -2)

Line 2: (3, -1) (7, 0)

This is what I did.

-2 - (-6) = 4

3- 4 = -1

0 - (-1) = -1

7 - 3 = 4

Would it be perpendicular?

Write the slope-intercept form of each line. Then determine wheather the graphs of the lines are parallel, perpendicular, or neither.

4x + 2y = 8

2x + y = 1

This is what I did

4x + 2y = 8 / 2

y = -2x + 1

slope-intercept form: y= -2x + 4

slope-intercept form: y= -2x + 1

Is it parallel?

Thanks