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Section 4.6: Slope Rebecca Fiorillo Camilla Jones Annie Gromelski

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What is slope? Slope equals Rise/Run. The slope of non-vertical line, segment, or ray containing (x 1,y 1 ) and (x 2,y 2 ) is defined by the formula m=y 2 -y 1 or m= y 1 -y 2 x 2 -x 1 x 1 -x 2

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What is slope? Continued Slope is used to find out or to describe the measurement of the steepness, incline, gradient, or grade of a straight line. Two points are used to find the slope with the y-points (rise)divided by the x-points (run). In other words, you are finding the ratio of the altitude change to the horizontal distance between any two points on the line.

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Slope of Parallel and Perpendicular Lines Theorem 26: if two non-vertical lines are parallel, then their slopes are equal. Example: If RF ll AG and mRF =2/5 then mAG=2/5 Theorem 27: if the slopes of two non- vertical lines are equal, the lines are parallel. Example: if mCJ=3/7 and mMP=3/7, then the lines are parallel.

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Slope of Parallel and Perpendicular Lines m

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Visual interpretations of slope Positive slope negative slope Zero slope no slope

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Sample Problems mAB=y 2 -y 1 x 2 -x 1 mAB= 5-(-3) 4-(-2) B (4,5) mAB= 8 = 4 6 3 A (-2, -3)

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Sample Problems Are these lines parallel? A (1,6) C (5,6) The Slopes are not parallel. mAB=6-1 = 5 The lines are not opposite 1-8 -7 reciprocals due to the fact that CD is a horizontal line mCD=6-0 = 6 which has no slope. 5-5 0 D (5,0) B (8,1)

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Sample Problems Are these lines parallel? C (2,10) A(2,6) mAB=6-2 =4 =2 = -2 2-4 -2 -1 mCD=10-4 =6 = 3 2-6 -4 -2 B(4,2) D(6,4) The lines are not parallel because they do not have the same slope.

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Example Problems Given: D is the midpoint AC B( 13,12) Find : 1. Slope of AC A (3,6) 2. Slope of BD D F C(9,2)

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Answers 1. -2/3 2. 8/7

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Example Problem 1.Given the points A=(3,5) and B=(4,9). Find the slope of line AB. 2. What is the slope of a horizontal line?

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Answers 1. mAB= 4 2. The slope of a horizontal line is 0.

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Example Problems 1. Find slope of AC 2. Find slope of AB C(6,6) A(4,-4) B(8,-10) 3. Find slope of CB

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Answers 1. mAC = 5 2. mAB = 3/-2 3. mCB = -8

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Works Cited "Math Facts.info: Slope." Math Facts.info: Mathfacts. Web. 19 Jan. 2011..

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