Slope (Parallel and Perpendicular Lines)

Are the given lines, parallel, perpendicular, or neither. Explain.

x = 1, and y = 0

• Parallel, they have the same slopes.

• Perpendicular, because their slopes are opposite reciprocals.

• Neither, because their slopes are not the same and are not opposite reciprocals.

• Neither, because their slopes are zero.

The points in the table lie on a line. What is the slope of the line?

• -3/2

• -2/3

• 2/3

• 3/2

What describes the slope of the line shown on the graph?

• Positive

• Negative

• Zero

• Undefined

What is the slope of a line that contains the points (1, -1) and (-2, 8)?

• -3

• -7/3

• -1/3

• 1/3

Find the Slope of the line shown in the graph.

• -2/3

• 2/3

• -3/2

• 3/2

Are the lines Perpendicular? How do you know?

Line 1 runs through the point (0, -1) and (7, 1)

Line 2 runs through the point (-1, 4) and (2, -5)

• Yes, their slopes are opposite reciprocals

• No, their slopes are not opposite reciprocals

• Yes, their slope are the same

• No, their slopes are not the same

Are the given lines parallel? How do you know?

y = 1, and y = 5

• No, they do not have the same slopes.

• No, their slopes are not opposite reciprocals.

• Yes, their slopes are opposite reciprocals.

• Yes, their slopes are the same.

Find the slope of the line shown in the graph.

• -1/5

• 1/5

• -5

• 5

The points in the table lie on a line. What is the slope of the line?

• 2

• 1/2

• -2

• -1/2

What is the slope of the line shown in the graph?

• Positive

• Negative

• Zero

• Undefined