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At their point of crossing, the space between two crossnig line is 0. From any point on either line you can always drop a perpendicular to the other line and this will be the shortest distance from that point to the other line.
A horizontal line crossing the y axis at 3.
it depends on how you place it, they can be. all a line segment is is a straight line, if you have two you can have parallel or crossing lines.
Tangent
a line of fit mean perfect line.