Yes, that's what makes them parallel lines - they have the same slope. So they never will intersect with each other. If a set of lines didn't have the same slope, at some point they would intersect and thus would not be parallel.
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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.
No but if the two lines are parallel then they will have the same slope.
Lines with the same slope but with different y intercepts are parallel.
Parallel lines have the same slope, which makes them parallel. However, they cannot have the same y intercept, or else it would be the same line.
The lines are parallel.