perpendiculars
("Opposite" is a pretty arbitrary condition in math. The slopes are negative reciprocals.)
and by negative that person means the opposite of what it is already, negative or positive, it's not always negative
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perpendicular.
fault
Parallel lines can have a line crossing both of them. They call that the transversal. Corresponding angles are on the same side of the transversal. Alternate are on opposite sides of the transversal.
Opposite sign? Additive inverse.
parallel lines