Table of Contents

- 1 Can parallel lines have a negative and positive slope?
- 2 Can parallel lines have negative slopes?
- 3 Can two lines with a positive slope be perpendicular?
- 4 What is the relationship between two lines whose slopes are 3 and 1 3?
- 5 What are the difference between positive and negative slope zero and undefined slope?
- 6 How do you tell if a slope is parallel/perpendicular or neither?
- 7 Is the reciprocal of a slope positive or negative?
- 8 How to determine the slope of a parallel line?

## Can parallel lines have a negative and positive slope?

If lines are parallel, they slant in exactly the same direction. If two lines are perpendicular and neither one is vertical, then one of the lines has a positive slope, and the other has a negative slope. Also, the absolute values of their slopes are reciprocals.

## Can parallel lines have negative slopes?

In other words, the slopes of parallel lines are equal. Note that two lines are parallel if their slopes are equal and they have different y-intercepts. In other words, perpendicular slopes are negative reciprocals of each other.

**Can a slope be negative and positive?**

If the line is sloping upward from left to right, so the slope is positive (+). If the line is sloping downward from left to right, so the slope is negative (-). A graph of this relationship has a negative slope.

**How can you tell if two lines are parallel?**

We can determine from their equations whether two lines are parallel by comparing their slopes. If the slopes are the same and the y-intercepts are different, the lines are parallel. If the slopes are different, the lines are not parallel. Unlike parallel lines, perpendicular lines do intersect.

### Can two lines with a positive slope be perpendicular?

Take note that two lines are perpendicular if their product of theirs slopes is -1. So when we have two positive slopes, their product will be positive. Therefore, when two lines have positive slopes, they are not perpendicular.

### What is the relationship between two lines whose slopes are 3 and 1 3?

The slope of two perpendicular lines are negative reciprocals of each other. That means that you flip the fraction upside down and take the opposite of it. The reciprocal of 13 is 3 . The opposite of 3 is −3 .

**What are opposite reciprocals?**

The term opposite reciprocals refers to two numbers that have opposite signs and are flipped fractions of each other. Second, to be reciprocals, one number should be the flipped fraction, or upside down version, of the other number. For example, the reciprocal or flipped fraction of 3/4 is 4/3.

**Are these slopes parallel?**

Parallel lines and their slopes are easy. Since slope is a measure of the angle of a line from the horizontal, and since parallel lines must have the same angle, then parallel lines have the same slope — and lines with the same slope are parallel.

#### What are the difference between positive and negative slope zero and undefined slope?

The slope of a line can be positive, negative, zero, or undefined. A horizontal line has slope zero since it does not rise vertically (i.e. y1 − y2 = 0), while a vertical line has undefined slope since it does not run horizontally (i.e. x1 − x2 = 0). because division by zero is an undefined operation.

#### How do you tell if a slope is parallel/perpendicular or neither?

Answer: Lines with the same slope are parallel and if the slope of one line is the negative reciprocal of the second line, then they are perpendicular.

**Can a pair of lines be parallel and perpendicular?**

never. parallel lines mean they should intersect and perpendicular means they should intersect at 90 degrees . these 2 cannot happen at same time.

**Can two lines with negative slopes be perpendicular?**

If the slopes of two lines are negative reciprocals, the lines are perpendicular. since their slopes of 0 have undefined reciprocals. Vertical and horizontal lines are perpendicular. Click to see full answer. Then, can two lines with negative slopes be parallel?

## Is the reciprocal of a slope positive or negative?

Another way of saying negative reciprocal is FLIP AND SWITCH, which means to take the slope of the first line, flip the fraction and switch the sign (positive to negative or vice versa). This is true for all perpendicular lines.

## How to determine the slope of a parallel line?

If you know the slope of one line you can determine the slope of the other line by switching the sign, and flipping the fraction. For example: If the slope of line m (the purple line) is -2 (-2/1) then

**Is the slope of y = 5x positive or negative?**

The line y = -5x has a negative slope (m = -5 is negative) and a zero y-intercept (b = 0). This means that the line passes through the origin (0, 0). In fact, the origin is both the y-intercept and the x-intercept for this line. The slope of -5 can be rewritten as rise/run = -5/1.