Evaluate each expression. ANSWER –1 ANSWER –0 BellRinger WarmUps

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Find slope in real life EXAMPLE 1 Skateboarding SOLUTION

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Standardized Test Practice EXAMPLE 2 SOLUTION Let (x1, y1) = (–1, 3) and (x2, y2) = (2, –1).

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for Examples 1 and 2 GUIDED PRACTICE 1. What If ? In Example 1, suppose that the rise of the ramp is changed to 12 inches without changing the run. What is the slope of the ramp? rise = 12 in.

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GUIDED PRACTICE for Examples 1 and 2

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GUIDED PRACTICE Find the slope of the line passing through the given points. 3. (0, 3), (4, 8) for Examples 1 and 2 4. (– 5, 1), (5, – 4) 6. (7, 3), (–1, 7) 5. (–3, –2), (6, 1)

Evaluate each expression. undefined 4. An Internet company had a profit of $2.6 million in retail sales over the last five years. What was its average annual profit? ANSWER $520,000 ANSWER BellRinger WarmUps

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Classify lines using slope EXAMPLE 3 Without graphing, tell whether the line through the given points rises, falls, is horizontal, or is vertical. SOLUTION Because m = 0, the line is
horizontal. Because m < 0, the line falls.

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Classify lines using slope EXAMPLE 3 Because m > 0, the line rises. Because m is undefined, the
line is vertical.

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GUIDED PRACTICE for Example 3 GUIDED PRACTICE Without graphing, tell whether the line through the given points rises, falls, is horizontal, or is vertical. 7. (–4, 3), (2, –6) Because m < 0, the line falls. ANSWER 8. (7, 1), (7, –1) Because m is undefined, the line is vertical. ANSWER

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GUIDED PRACTICE for Example 3 GUIDED PRACTICE 9. (3, –2), (5, –2) Because m = 0, line is horizontal. 10. (5, 6), (1, –4) Because m > 0 the line rises. ANSWER ANSWER Without graphing, tell whether the line through the given points rises, falls, is horizontal, or is vertical.

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Classify parallel and perpendicular lines EXAMPLE 4 Tell whether the lines are parallel, perpendicular, or
neither. SOLUTION

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Classify parallel and perpendicular lines EXAMPLE 4

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GUIDED PRACTICE for Example 4 GUIDED PRACTICE Tell whether the lines are parallel, perpendicular, or neither. ANSWER ANSWER perpendicular neither

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