The lines are parallel.
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Lines with the same slope but with different y intercepts are parallel.
No but if the two lines are parallel then they will have the same slope.
Intersecting lines NEVER have the same slope. However, if the lines are identical, meaning all their points are the same, then they will, of course, have the same slope as well as everything else. On the other hand, parallel lines have the same slope, but they do not share a single point.
For two lines to be parallel they must have the same slope. A line parallel to a line with slope -2 would have a slope of -2.