Parallel Lines.   Two lines that have the same slope.   If you graph them they will never intersect.   We can find the equation of a line parallel.

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Presentation transcript:

Parallel Lines

  Two lines that have the same slope.   If you graph them they will never intersect.   We can find the equation of a line parallel to a given line and going through a given point by: a.) first finding the slope (m) of the given line b.) finding the equation of the line through the given point with slope m.

Testing if Lines are Parallel Are these lines parallel? 1.Find the slope The slope m = Find the slope of the parallel line. The slope m = -4 Since the slopes are equal the lines are parallel.

Graphs of Parallel Lines The red line is the graph of y = – 4x – 3 and the blue line is the graph of y = – 4x – 7

Practice Testing if Lines are Parallel Are the lines parallel? Since the slopes are different the lines are not parallel. Are the lines parallel? Since the slopes are equal the lines are parallel.

Constructing Parallel Lines Find the equation of a line going through the point (3, -5) and parallel to Using the point-slope equation where the slope m = - 2 / 3 and the point is (3, -5) we get

Practice Constructing Parallel Lines Find the equation of the line going through the point (4,1) and parallel to Find the equation of the line going through the point (-2,7) and parallel to

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