Parallel Lines and Slopes

If the lines are parallel to each other and the slope of the blue line is 1/4, what is the slope of the purple line?

• 4

• -4

Parallel lines have _________________ slope.

• The Same

• Opposite Reciprocal

What slope is perpendicular to:  
m = 5/8

• -5/8

• 5/8

• -8/5

• 8/5

Slopes of Parallel lines are ____________?

• opposites

• reciprocals

• equal

• oppostie reciprocals

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 Parallel? How do you know? Line 1 runs through the points (-6, 6) and (0, 5) Line 2 runs through the points (0, -3) and (6, -4)

• Yes, their slopes are opposite reciprocals

• Yes, their slopes are the same

• No, their slopes are opposite reciprocals

• No, their slope are 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.

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

• 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.