Parallel and Perpendicular Lines

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet. They have the same slope.

Tags

CCSS.HSG.CO.A.1

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees). Their slopes are negative reciprocals.

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Front

If two lines have slopes m1 and m2, when are they parallel?

Back

Two lines are parallel if m1 = m2.

Tags

CCSS.8.EE.B.6

Front

If two lines have slopes m1 and m2, when are they perpendicular?

Back

Two lines are perpendicular if m1 * m2 = -1.

Tags

CCSS.8.EE.B.6

Front

What is the slope of a line perpendicular to a line with slope 4?

Back

The slope of a line perpendicular to a line with slope 4 is -1/4.

Tags

CCSS.8.EE.B.6

Front

What is the slope of a line perpendicular to a line with slope -2?

Back

The slope of a line perpendicular to a line with slope -2 is 1/2.

Tags

CCSS.8.EE.B.6

Front

Given the equations y = 2x + 3 and y = 2x - 5, are these lines parallel, perpendicular, or neither?

Back

These lines are parallel.

Front

Given the equations y = 1/2x + 1 and y = -2x + 3, are these lines parallel, perpendicular, or neither?

Back

These lines are perpendicular.

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

Front

What is the slope of the line represented by the equation y = -3x + 4?

Back

The slope of the line is -3.

Tags

CCSS.8.EE.B.5

Front

What is the slope of the line represented by the equation y = 5x - 2?

Back

The slope of the line is 5.

Tags

CCSS.8.EE.B.5