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Section 3.3 – Slope of Line

Section 3.3 – Slope of Line. November 1, 2010. Slope formulas. · m = ·Example – find the slope of a line containing the points (1,2) and (3,4) * Always simplify slope if possible. Types of Slope. · Undefined - no slope – vertical line ·Negative - falling ·Zero – horizontal line

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Section 3.3 – Slope of Line

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  1. Section 3.3 – Slope of Line November 1, 2010

  2. Slope formulas · m = ·Example – find the slope of a line containing the points (1,2) and (3,4) * Always simplify slope if possible

  3. Types of Slope ·Undefined - no slope – vertical line ·Negative - falling ·Zero – horizontal line ·Positive - rising

  4. Parallel and Perpendicular lines ·PARALLEL lines have the SAME slope ·PERPENDICULAR line have slopes that are OPPOSITE RECIPROCALS. This also means the slopes have a product of -1.

  5. Examples: determine the slope of each line and find the slope of the parallel and perpendicular lines. ·Y = 2/3x +5 (remember y=mx + b?) Slope is 2/3 - it is rising Slope of parallel lines = 2/3 Slope of perpendicular lines = -3/2 ·Y = -4x – 2 Slope is ____ it is ________ Parallel slope __ _ Perpendicular ____

  6. More examples… a little harder. Find the slope of the line plus the parallel and perpendicular slopes ·Points (4 , 7) and (8 , -9) ·Points (-5 , 7) and ( 2 , 7) ·Points (-4 , 2) and (-4 , 9)

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