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Published byGordon Hall Modified over 6 years ago

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Warm-up Graph: 4x – 6y = 18 Write the equation of the line with slope ½ and through the point (4, -5). Use point slope form. Write it in slope intercept form

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**3.6 Slopes of Parallel and Perpendicular Lines**

10/31 with practice on 11/1

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Learning Targets I can tell if two lines are parallel or perpendicular by finding their slopes. I can write equations of parallel and perpendicular lines.

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**Parallel Lines have equal slopes (and different y intercepts) **

Line 1 contains A(-4, 2) and B(3, 1) Line 2 contains C(-4, 0) and D(8, -2) Are Lines 1 and 2 Parallel? Hint, find the slopes

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**Are Lines 4y – 12x = 20 and y = 3x -1 Parallel?**

Are lines y = x + 6 and 2x + 4y = 20 Parallel?

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**Write an equation for the line parallel to y = -4x + 3 and through the point (1, -2)**

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**Perpendicular Lines have slopes that are negative reciprocals of each other (their product is -1)**

What is a negative reciprocal?

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**Line 1 goes through (-2, 3) and (6, -3) **

Are lines 1 and 2 Perpendicular? Hint: find the slopes

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**Are the following lines perpendicular?**

2x – 7y = -42 4y = -7x – 2

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**Are the following lines perpendicular?**

2x + 3y = 6 6x – 4y = 24

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**Write an equation of a line Perpendicular to y = -3x + 5 and through the point (-3, 7)**

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**Write the equation for a line that contains (1, 8) and is perpendicular to y = ¾ x + 1**

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**No homework, but be prepared to practice this further.**

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Day 3 Review (11/1) Practice worksheet with follow up quiz on Monday

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**Monday 11/4 Review, go over hmwk wkst, review problems**

Quiz with mins left

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Homework p. 314 #2-36 even

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