Understanding Parallel and Perpendicular Lines

What is the defining characteristic of parallel lines in terms of their slopes?

• They have different slopes.

• They have the same slope.

• They intersect at a right angle.

• They have the same y-intercept.

If two lines are parallel, what can be said about their y-intercepts?

• They must be the same.

• They must be different.

• They must be zero.

• They must be positive.

How do you determine the slope of a line in standard form?

• By using the formula b over a.

• By using the formula negative a over b.

• By using the formula negative b over a.

• By using the formula a over b.

What is the slope of a line parallel to y = 3x - 2?

• 1/3

• -3

• -1/3

• 3

What is the relationship between the slopes of perpendicular lines?

• They are both negative.

• They are both positive.

• They are negative reciprocals.

• They are equal.

If a line has a slope of 2/3, what is the slope of a line perpendicular to it?

• 3/2

• -3/2

• -2/3

• 2/3

How do you find the slope of a line perpendicular to y = 2x - 3?

• Add 1 to the original slope.

• Change the sign and flip the fraction of the original slope.

• Double the original slope.

• Keep the original slope the same.

What is the y-intercept of a line that passes through the point (0, 3)?

• 3

• 0

• 1

• -3

What is the first step in graphing a line in standard form?

• Convert to slope-intercept form.

• Find the x-intercept and y-intercept.

• Find the midpoint.

• Find the slope.

What is the slope of a line perpendicular to a line with slope -10?

• 10

• -1/10

• -10

• 1/10