They have equal slopes, equal y-intercepts, equal x-intercepts,
and if they are line segments, then they have equal lengths.
Same slope and intercepts
Two lines that coincide look and act exactly like a single line. If you have one straight line, there are an infinite number of planes in which it lies.
They have an infinite number of solutions.
Zero. A null angle is formed by two straight lines that coincide.
They are four lines that coincide pairwise in at least four distinct points.
In science, "coincide" typically means when two or more events or conditions happen to overlap or occur at the same time or place. It implies a relationship of synchrony or alignment between different factors being studied.
false
No. All of them do but two. The latitude lines at 90 degrees North and South actually coincide with the intersection of all longitudinal lines. So technically, because they coincide, they do not form any angle.
yes
No. The planes must either coincide (they are the same, and intersect everywhere), be parallel (never intersect), or intersect in exactly one line.
Biology and anatomy often coincide because the two subjects both have to do with the body.
If the slopes are different the lines are neither - they intersect. They are parallel or coincident if the slopes are the same. Then, if the y-intercepts are the same they are coincident while if the y-intercepts are different, they are parallel.