Parallel and Perpendicular Lines and Their Slopes

Which two lines are parallel?

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Which two lines are parallel?

Which two lines are perpendicular?

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

What do we call lines that cross?

• Parallel

• Perpendicular

• Intersecting

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Will these lines ever intersect? How do you know?

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

What do we call lines that intersect and form 90 degree angles?

• Parallel

• Perpendicular

• Intersecting

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Slopes of parallel lines are...

• opposite reciprocals.
• opposites.
• the same.
• always 7.

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CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Slopes of perpendicular lines are...

• opposite reciprocals.
• opposites.
• the same.
• always 7.

y = -2/3x + 2
y = 3/2x + 9
These lines are...

• Parallel
• Perpendicular
• Neither

Tags

CCSS.HSG.CO.A.1

What slope is perpendicular to:  
m = 5/8

• -5/8
• 5/8
• -8/5
• 8/5

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1