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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November 1, 2010
· m =
·Example – find the slope of a line containing the points (1,2) and (3,4)
* Always simplify slope if possible
·Undefined - no slope – vertical line
·Negative - falling
·Zero – horizontal line
·Positive - rising
·PARALLEL lines have the SAME slope
·PERPENDICULAR line have slopes that are OPPOSITE RECIPROCALS. This also means the slopes have a product of -1.
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 ____
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)