If the line is perpendicular, its slope should be
If the line is parallel, the slope should remain the same (ie.
Perpendicular lines have slopes that are the negative reciprocal of each other, and since the slope of
What do parallel lines mean? It means that they'll never touch. If two lines have the same slope but different y-intercepts, they will never touch. Just visualize it.
And, well, if the other line that you didn't specify meets none of the above criteria, then it is neither.
Hope this helps!
A fellow highschool student.