Topic: Slopes of Lines Section: 3-3 Concept.

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Presentation transcript:

Topic: Slopes of Lines Section: 3-3 Concept

A. Find the slope of the line. Find the Slope of a Line A. Find the slope of the line. Substitute (–3, 7) for (x1, y1) and (–1, –1) for (x2, y2). Example 1

B. Find the slope of the line. Find the Slope of a Line B. Find the slope of the line. Substitute (0, 4) for (x1, y1) and (0, –3) for (x2, y2). Slope formula Substitution Simplify. Answer: The slope is undefined. Example 1

C. Find the slope of the line. Find the Slope of a Line C. Find the slope of the line. Substitute (–2, –5) for (x1, y1) and (6, 2) for (x2, y2). Slope formula Substitution Simplify. Answer: Example 1

D. Find the slope of the line. Find the Slope of a Line D. Find the slope of the line. Substitute (–2, –1) for (x1, y1) and (6, –1) for (x2, y2). Slope formula Substitution Simplify. Answer: 0 Example 1

Concept

Concept

Determine Line Relationships Determine whether and are parallel, perpendicular, or neither for F(1, –3), G(–2, –1), H(5, 0), and J(6, 3). Example 3

Determine whether AB and CD are parallel, perpendicular, or neither for A(–2, –1), B(4, 5), C(6, 1), and D(9, –2) A. parallel B. perpendicular C. neither Example 3

Use Slope to Graph a Line Graph the line that contains Q(5, 1) and is parallel to MN with M(–2, 4) and N(2, 1). Example 4

Graph the line that contains R(2, –1) and is parallel to OP with O(1, 6) and P(–3, 1). A. B. C. D. none of these Example 4