What is important about family of lines?

1 Answer
Alex Boroda
May 27, 2015

A family of lines is a set of lines that have something in common with each other.

In brief, we can have two types of families of lines:

  1. one where the slope is the same → keep the slope unchanged and vary the y-intercept → parallel lines
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  2. one where the y-intercept is the same → keep the y-intercept unchanged and vary the slope → concurrent lines
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