They are lines that are not horizontal nor vertical.
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Parallel lines have the same slope.
No, parallel lines have exactly same slope Perpendicular line have a slope that is negative reciprocal of each other that is if m = slope of line then slope of perpendicular line is -1/m
The slopes will be the same. It is also possible that both parallel lines have no slope defined - if they are vertical.
No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.
If they have the same slope but different y intercepts then they are parallel