## How do you write an equation for a perpendicular line?

Correct answer: Perpendicular lines have opposite-reciprocal slopes, so the slope of the line we want to find is 1/2. Plugging in the point given into the equation y = 1/2x + b and solving for b, we get b = 6. Thus, the equation of the line is y = ½x + 6. Rearranged, it is –x/2 + y = 6.

### How do you determine 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.

#### What is perpendicular example?

Perpendicular – Definition with Examples Two distinct lines intersecting each other at 90° or a right angle are called perpendicular lines. Example: Here, AB is perpendicular to XY because AB and XY intersect each other at 90°. Non-Example: The two lines are parallel and do not intersect each other.

How do you know if a line is perpendicular?

Two lines are perpendicular if and only if the product of their slopes is . In other words, the slope of a line that is perpendicular to a given line is the negative reciprocal of that slope. Thus, for a line with a given slope of 3, the line perpendicular to that slope must be the negative reciprocal of 3, or .

How do you know if a line is parallel or perpendicular?

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.

## How do you prove two lines are parallel?

If two lines are cut by a transversal and the alternate exterior angles are equal, then the two lines are parallel. Angles can be equal or congruent; you can replace the word “equal” in both theorems with “congruent” without affecting the theorem. So if ∠B and ∠L are equal (or congruent), the lines are parallel.

### What is the equation of a line perpendicular to y 2x 3?

The slope of the line perpendicular to this is the neagtive inverse of -1/2. The required equation of the line perpendicular to y = 2x – 3 and that passes through (0, 0) is x + 2y = 0.

#### What do two parallel lines mean in an equation?

In mathematical terms, two lines are said to be parallel if they have the exact same slope. Remember our equation for a line, y = mx + b. Two parallel lines, each defined by their own equation, will have the same value for m, the slope.

How to write equations of perpendicular?

You must know the structure of a straight-line equation before you can write equations for parallel or perpendicular lines. The standard form of the equation is “y = mx + b,” in which “m” is the slope of the line and “b” is the point where the line crosses the y-axis.

How do you find the equation of perpendicular lines?

Perpendicular Line Formula. Perpendicular line is a straight line through a point. It makes an angle of 90 degree with a particular point through which the line passes. Coordinates and line equation is the prerequisite to find out the perpendicular line. Consider the equation of the line is ax + by + c = 0 and coordinates are ( x1, y1 ),…

## How to draw parallel and perpendicular lines?

This presentation has been made for you byFRANCISCO GUIJARRO BELDA From Isaac Albéniz Secondary School Leganés.

• and you want to draw a lineparallel to it passing…
• PARALLEL LINES2) Align the set square with line m as you see in the picture.
• move the set square in order to keep both rulers together.Hold the big set…
• PARALLEL LINES4) gently slide th…