Parallel and Perpendicular Slopes of Lines

Which of the following statements is true about parallel lines?

• Parallel lines never intersect bc they have the same slope.

• Parallel lines never intersect bc they have opposite reciprocal slopes.

• Parallel lines never intersect bc they have negative slopes.

Which of the following statements is true about perpendicular lines?

• Perpendicular lines never intersect bc they have the same slope.

• Perpendicular lines intersect bc they have opposite reciprocal slopes.

• Perpendicular lines never intersect bc they have negative slopes.

If a line has a slope m=-5/9, then what is the slope of the line that is perpendicular to it?

• m=-9/5

• m=5/9

• m=9/5

If a line has a slope m=-5/9, then what is the slope of the line that is parallel to it?

• m=-9/5

• m=-5/9

• m=9/5

If a line has a slope m=2/9, then what is the slope of the line that is parallel to it?

• m=-9/2

• m=2/9

• m=9/2

If a line has a slope m=2/9, then what is the slope of the line that is perpendicular to it?

• m=-9/2

• m=2/9

• m=9/2

If a line has a slope m=-1/2, then what is the slope of the line that is perpendicular to it?

• m=2/1

• m=1/2

• m=-1/2

If a line has a slope m=-1/2, then what is the slope of the line that is parallel to it?

• m=2/1

• m=1/2

• m=-1/2

If a line has a slope m=-7, then what is the slope of the line that is parallel to it?

• m=-7

• m=-1/7

• m=-1/7

If a line has a slope m=-7, then what is the slope of the line that is perpendicular to it?

• m=1/7

• m=-1/7

• m=-7