Perpendicular lines from equation  Mathematics I  High School Math  Khan Academy  Summary and Q&A
TL;DR
Two lines are perpendicular if they intersect at right angles and have slopes that are negative inverses of each other.
Questions & Answers
Q: What is the definition of perpendicular lines?
Perpendicular lines intersect at right angles and have slopes that are negative inverses of each other.
Q: How can you determine if two lines are perpendicular?
To determine if two lines are perpendicular, you can check if the product of their slopes is equal to 1.
Q: Can two lines with positive slopes be perpendicular?
No, two lines with positive slopes cannot be perpendicular. Perpendicular lines have slopes that are negative inverses of each other.
Q: How can you find the slope of a line in slopeintercept form?
In slopeintercept form (y = mx + b), the coefficient of x represents the slope of the line.
Summary & Key Takeaways

Perpendicular lines intersect at right angles and have slopes that are negative inverses of each other.

The product of the slopes of perpendicular lines is always equal to 1.

Line A and Line B are perpendicular because their slopes, 3 and 1/3, are negative inverses of each other.