Slope = change in y change in x Understanding Slope COURSE 3 LESSON 3-3 Using coordinates, find the slope of the line between P (–2, 3) and Q (–1, –1).

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Presentation transcript:

slope = change in y change in x Understanding Slope COURSE 3 LESSON 3-3 Using coordinates, find the slope of the line between P (–2, 3) and Q (–1, –1). 3 – (–1) –2 – (–1) = Subtract the coordinates of point Q from the coordinates of point P. 4 –1 = or –4 Simplify. 3-3

Understanding Slope COURSE 3 LESSON 3-3 Find the slope of the line in the graph. Describe how one variable changes in relation to the other. 75 – – 100 = Use coordinates of two points. = Subtract. The cost increases by $25 for every 100 miles traveled. slope = change in y change in x Simplify = 3-3

Understanding Slope COURSE 3 LESSON 3-3 Find the slope of each line. State whether the slope is zero or undefined. a. line k Division by zero is undefined. The slope of a vertical line is undefined. b. line p The slope of a horizontal line is zero. slope = = = 0 2 – 2 –2 – 3 0 –5 slope = = 1 – (–3) 2 –

Understanding Slope COURSE 3 LESSON 3-3 The data in the table below are linear. Use the data to find the slope. Then graph the data and the line. x– y– slope = = or 2 change in y change in x

Understanding Slope 1.Find the slope of each line. a. line sb. line t 2.The data in the table below is linear. Find the slope. x y–6–12–15 –27 COURSE 3 LESSON 3-3 undefined –