A line is the locus of points such that the gradient (slope) between that point and one fixed point in the plane is a constant.
Technically, that definition does not include a vertical line because its gradient is not defined! You could get around that this by requiring that either the gradient is a constant or, if it is undefined, then the inverse gradient (dx/dy) is constant.
a straight line ..
I believe that is the definition of a straight line.
Two parallel lines.
A line in 2D and a plane in 3D A perpendicular bisector of the line connecting the 2 given points
The perpendicular bisector of the line joining the two points.
No. A line is the locus of all points located between any two points.
line
are the same distance from two points... Apex - TF
a straight line ..
All points on the same line are colinear but if you mean what are the points all called collectively - they represent a "locus of points".
The locus of points at a given distance to a line would be a line parallel to the first line. Assuming that both lines are straight.
The perpendicular bisector of the straight line joining the two points.
parabola
Straight line
I believe that is the definition of a straight line.
A line that is the angle bisector.
Two parallel lines.