Parallel and Perpendicular Lines Calculator
Enter the slope of the given line and the point the new line passes through — you will get the parallel (same slope) or perpendicular (negative reciprocal) line equation with steps.
How to use
- Enter the slope and point, then select the relation.
- Special cases for perpendicular lines are also handled (horizontal/vertical, slope 0 or undefined).
Note: Parallel lines have equal slopes. The slopes of perpendicular lines multiply to −1, that is m₂ = −1/m₁.