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3-3 Slopes of Lines
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3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Jan 03, 2016

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Page 1: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

3-3 Slopes of Lines

Page 2: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

CCSS

Content StandardsG.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line that passes through a given point).Mathematical Practices4 Model with mathematics.7 Look for and make use of structure.8 Look for and express regularity in repeated reasoning.

Page 3: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Then/Now

You used the properties of parallel lines to determine congruent angles.

• Find slopes of lines.

• Use slope to identify parallel and perpendicular lines.

Page 4: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Vocabulary

• slope

• rate of change

Page 5: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Concept

Page 6: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Concept

Page 7: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

A.

B.

C.

D.

Example 1aA. Find the slope of the line.

Page 8: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

A. 0

B. undefined

C. 7

D.

Example 1bB. Find the slope of the line.

Page 9: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

A.

B.

C. –2

D. 2

Example 1cC. Find the slope of the line.

Page 10: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

A. 0

B. undefined

C. 3

D.

Example 1dD. Find the slope of the line.

Page 11: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Concept

Page 12: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Example 3Determine Line Relationships

Step 1 Find the slopes of and .

Determine whether and are parallel, perpendicular, or neither for F(1, –3), G(–2, –1), H(5, 0), and J(6, 3). Graph each line to verify your answer.

Page 13: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Example 3Determine Line Relationships

Step 2 Determine the relationship, if any, between thelines.

The slopes are not the same, so and are not parallel. The product of the slopes is

So, and are not

perpendicular.

Page 14: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Example 3Determine Line Relationships

Answer: The lines are neither parallel nor perpendicular.

Check When graphed, you can see that the lines arenot parallel and do not intersect in right angles.

Page 15: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.

Example 3

A. parallel

B. perpendicular

C. neither

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

Page 16: 3-3 Slopes of Lines. CCSS Content Standards G.GPE.5 Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems.