Answer:
No parallel lines
Lines 1 and 3 are perpendicular
Step-by-step explanation:
Given:



Required
Determine if they are parallel, perpendicular or not
The slope intercept of a line has the form:

Where

First, we calculate the slope of each lines

Compare the above to 



Make -6y the subject

Divide through by -6




Compare the above to 



Divide through by 3

Compare the above to 

So, we have:



None of the slopes are the same, so none of the lines are parallel.
However, lines 1 and 3 are perpendicular.
This is shown below
When the slope of two lines satisfy the following condition, then they are perpendicular.

This gives:


Convert / to *

