We are given the lines
Line 1

Line 2

Line 3

We want to determine the pair that are parallel, perpendicular or neither
Solution
In order to determine that, we need to obtain the slope of each lines
Note: (1) if the slopes are equal, then they are parallel;
(2) If the product of the slopes equal neagtive one (-1), then they are perpendicular;
(3) Otherwise, they are neither
Now, we will obtain the slope of the lines
We will write each of the equation in this form

Thus, the slope will be the coefficient of x (i.e m)
For Line 1

For Line 2

For Line 3

Now, Let us consider Line 1 and Line 2

Therefore, Line 1 and Line 2 are neither parallel nor perpendicular
For Line 1 and Line 3

Therefore, Line 1 and Line 3 are neither parallel nor perpendicular
We consider finally Line 2 and Line 3

Therefore, Line 2 and Line 3 are perpendicular