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Q: Two lines that coincide have how many solutions or points in common?

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the parallel lines never intercept so they do not have any common points.

parallel

No, parallel lines never intersect, so they do not have any points in common. Intersecting lines have one common point.

If two lines cross they share a point of intersection. For two straight lines this is limited to one common point, for two circles two points and for complex lines like two sine waves the number of common points has no limit.

Parallel lines lying in a plane do not intersect each other. They share exactly zero points in common.

Related questions

one solution

They are four lines that coincide pairwise in at least four distinct points.

If the lines intersect, then the intersection point is the solution of the system. If the lines coincide, then there are infinite number of the solutions for the system. If the lines are parallel, there is no solution for the system.

one solution; the lines that represent the equations intersect an infinite number of solution; the lines coincide, or no solution; the lines are parallel

the parallel lines never intercept so they do not have any common points.

Parallel lines have no points in common

parallel

If the two lines are actually "on top of each other", they can have infinitely many points in common. If they are parallel, they have no points in common. If they are perpendicular, they have one point in common.

Parallel lines or skew lines

If there are no common points but both lines lie n the same plane they are considered "coplanar points"

One.

The lines are PARALLEL.

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