Parallel & Perpendicular Lines

Parallel lines have

• the exact same slope
• opposite reciprocal slopes
• the same y intercept
• opposite reciprocal y intercepts

Tags

CCSS.HSG.CO.A.1

CCSS.HSG.GPE.B.5

Perpendicular lines have

• the exact same slope
• opposite reciprocal slopes
• the same y intercept
• opposite reciprocal y intercepts

Tags

CCSS.HSG.CO.A.1

CCSS.HSG.GPE.B.5

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

• Parallel
• Perpendicular
• Neither
• The same line

Tags

CCSS.HSA.REI.C.6

CCSS.HSG.GPE.B.5

-6x + y = 2
6x + y = 2
These lines are...

• Parallel
• Perpendicular
• Neither

Tags

CCSS.HSA.REI.C.6

CCSS.HSG.CO.A.1

CCSS.HSG.GPE.B.5

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

• Parallel
• Perpendicular
• Neither

Tags

CCSS.HSG.CO.A.1

CCSS.HSG.GPE.B.5

What is the slope of a line parallel to the line whose equation is:  -2x + y = - 7?

• -2
• 1/2
• -1/2
• 2

Tags

CCSS.HSG.GPE.B.5

A line is perpendicular to        y = 2x - 7.
What is the slope of this line? 

• -2
• 1/2
• -1/2
• 2

Tags

CCSS.HSG.GPE.B.5

To determine if lines are parallel or perpendicular by looking at their equations you should

• Write the equations in slope intercept form and compare the slopes of the lines.
• Write the equations in standard form and compare the slopes.
• Find the x and y intercepts.
• Guess

Tags

CCSS.HSG.GPE.B.4

CCSS.HSG.GPE.B.5