Parallel and Perpendicular Lines

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Parallel and Perpendicular Lines
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Parallel

• Definition If two nonvertical lines have the
  same slope, then they are parallel

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Example 1

• Determine weather quadrilateral ABCD
• Is a parallelogram if its vertices are
• A(-5, -3) B(5, 3) C(7, 9) D(-3, 3).

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Example 2

• Write an equation in slope-intercept form of the
  line that passes through
• (4, 0) and is parallel to the graph of
• 4x-3y2.

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Perpendicular

• Definition If the product of the two slopes of
  two lines is 1, then the lines are perpendicular
  to the graph of
• 5x-3y7.

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Example 5

• Write a slope-intercept form of an equation that
  passes through (8, -2)
• And is perpendicular to the graph of
• 5x-3y7