If the slope of one line is $$m_1$$ , what is the slope of a line that is perpendicular to it?

The slope of a line that is perpendicular to $$m_1$$ is $$m_2 = -\frac{1}{m_1}$$ (the opposite reciprocal).

What is the slope of a line parallel to a line with slope $$\frac{3}{4}$$ ?

The slope of a line parallel to a line with slope $$\frac{3}{4}$$ is also $$\frac{3}{4}$$ .

What is the slope of a line perpendicular to a line with slope $$5$$ ?

The slope of a line perpendicular to a line with slope $$5$$ is $$-\frac{1}{5}$$ .

What is the relationship between the slopes of intersecting lines?

Intersecting lines can have any slopes; they are not necessarily parallel or perpendicular.

If a line has a slope of $$-\frac{1}{4}$$ , what is the slope of a line that is parallel to it?

The slope of a line that is parallel to it is also $$-\frac{1}{4}$$ .

What is the slope of a line perpendicular to a line with slope $$-\frac{2}{5}$$ ?

The slope of a line perpendicular to a line with slope $$-\frac{2}{5}$$ is $$\frac{5}{2}$$ .

What is the slope of a line parallel to a line with slope $$\frac{7}{8}$$ ?

The slope of a line parallel to a line with slope $$\frac{7}{8}$$ is also $$\frac{7}{8}$$ .

If the equation of a line is $$y = 3x + 1$$ , what is the slope?

The slope of the line is $$3$$ .

What is the slope of a line that is perpendicular to a line with slope $$\frac{1}{2}$$ ?

The slope of a line that is perpendicular to a line with slope $$\frac{1}{2}$$ is $$-2$$ .

If two lines have the same slope, what can be concluded about them?

If two lines have the same slope, they are parallel.

Parallel and Perpendicular Lines Flashcard

Student preview

15 questions

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1.

FLASHCARD QUESTION

Front

What is the definition of parallel lines?

Back

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

Tags

CCSS.HSG.CO.A.1

2.

FLASHCARD QUESTION

Front

What is the definition of perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees).

Tags

CCSS.4.G.A.1

CCSS.HSG.CO.A.1

3.

FLASHCARD QUESTION

Front

Back

Tags

CCSS.8.EE.B.6

4.

FLASHCARD QUESTION

Front

Back

Tags

CCSS.8.EE.B.5

5.

FLASHCARD QUESTION

Front

Back

These lines are perpendicular because their slopes are opposite reciprocals.

6.

FLASHCARD QUESTION

Front

Back

Tags

CCSS.8.EE.B.6

7.

FLASHCARD QUESTION

Front

What is the relationship between the slopes of parallel lines?

Back

The slopes of parallel lines are equal.

Tags

CCSS.8.EE.B.5

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