In a Euclidean plane any two distinct points uniquely define a straight line.
Yes. In fact, if they are not the same plane, then they must intersect in a unique straight line.
In order to draw a straight line, two unique ordered pairs are needed. This is because two unique points determine a line and an ordered pair represents a point.
No. Consider four points at the corners of a perfect square.
Yes. If it is not straight, then it is not a line.
No. The equation describes a straight line and the coordinates of any one of the infinitely many points on the line is a solution.
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Displacement of a straight line is zero...
A straight line has no vertex.
If it is not straight, then it is not a line.
it just a straight line
There are 180 degrees on a straight line.