Parallel & Perpendicular Lines Flashcard

Front

What are parallel lines?

Back

Lines that never intersect and have the same slope.

Front

What are perpendicular lines?

Back

Lines that intersect at a right angle (90 degrees) and have slopes that are negative reciprocals of each other.

Front

What is the slope of a line?

Back

The slope is a measure of the steepness of a line, calculated as the rise over run (change in y over change in x).

Front

If two lines have the same slope, what can we conclude about them?

Back

They are parallel.

Front

What is the relationship between the slopes of perpendicular lines?

Back

The slopes are negative reciprocals of each other.

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Back

Front

Back

Front

How can you determine if two lines are parallel from their equations?

Back

If the coefficients of x and y are proportional, the lines are parallel.

Front

How can you determine if two lines are perpendicular from their slopes?

Back

If the product of their slopes is -1, the lines are perpendicular.

Front

What is the slope-intercept form of a line?

Back