Parallel & Perpendicular Lines & their Slopes

If lines are parallel, they do not intersect.

• TRUE

• FALSE

Perpendicular lines do not intersect.

• TRUE

• FALSE

Parallel lines intersect to form 90^o angles.

• False. They intersect to form 30^o angles.

• False. They intersect to form 40^o angles.

• False. They do not intersect.

• True

If lines are perpendicular, their slopes are the same.

• TRUE

• FALSE

If a pair of lines have slopes that are negative reciprocals (inverses) of each other, then the lines are

• Parallel

• Perpendicular

• Neither

If a pair of lines are not parallel, then they must be perpendicular.

• TRUE

• FALSE

If a pair of lines have the same slope, then the lines must be

• Parallel

• Perpendicular

• Neither

Line a has a slope of 3. Line b has a slope of -6. Since the slopes are not the same, line a must be perpendicular to line b.

• TRUE

• FALSE

Line w is perpendicular to line v. If the slope of line w is -2, what is the slope of line v ?

Line h has a slope of 7. Line g has a slope of 7. What must be true about these lines?

• line h and line g are parallel

• line h and line g are perpendicular

• line h and line g are neither parallel or perpendicular

• line h and line g are both parallel and perpendicular