4.3 Parallel vs. Perpendicular Lines

Front

What is the definition of parallel lines?

Back

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

Front

What is the definition of perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees). The slopes of perpendicular lines are negative reciprocals of each other.

Front

If a line has a slope of 2, what is the slope of a line perpendicular to it?

Back

Front

Back

The slope of the line is 4.

Front

How do you find the slope of a line given two points (x1, y1) and (x2, y2)?

Back

Front

What is the point-slope form of a line?

Back

Front

Write the point-slope form of a line with slope 3 passing through the point (2, 5).

Back

Front

What is the slope-intercept form of a line?

Back

Front

Write the slope-intercept form of a line with slope -1 that passes through the point (0, 4).

Back

Front

If two lines have slopes of 5 and -rac{1}{5}, what can be said about their relationship?

Back

The lines are perpendicular to each other.