This video tutorial explains the concepts of parallel and perpendicular lines, focusing on their slopes. Parallel lines have the same slope, while perpendicular lines have slopes that are opposite reciprocals. The video provides examples and exercises to help understand these concepts, including how to calculate slopes and determine if lines are parallel, perpendicular, or neither.

What is the defining characteristic of parallel lines?

• They intersect at acute angles.

• They never intersect.

• They are always horizontal.

• They intersect at right angles.

How do perpendicular lines intersect?

• At right angles

• They do not intersect

• At obtuse angles

• At acute angles

What are skew lines?

• Lines that intersect at right angles

• Lines that are parallel

• Lines that never intersect

• Lines that intersect but not at right angles

What is true about the slopes of parallel lines?

• They are undefined.

• They are equal.

• They are zero.

• They are opposite reciprocals.

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

• 1/2

• -2

• -1/2

• 2

What does 'opposite reciprocal' mean in terms of slopes?

• The same slope

• The slope multiplied by 2

• The negative inverse of a slope

• The slope divided by 2

If a line has a slope of 3, what is the slope of a line perpendicular to it?

• 3

• 1/3

• -1/3

• -3

How can you determine if two lines are parallel?

• They intersect at a right angle.

• Their slopes are opposite reciprocals.

• They have the same y-intercept.

• Their slopes are equal.

What is the relationship between lines if their slopes are opposite reciprocals?

• They are parallel.

• They are perpendicular.

• They are skew.

• They are coincident.