Skill: parallel-perpendicular
Parallel & Perpendicular Tool
Enter a line and a point: the tool writes the parallel and the perpendicular through the point, shows every step, and graphs all three.
1 Parallel & Perpendicular Through a Point
Give a line (slope m, intercept b) and a point. The tool builds both new lines and draws everything.
Input
Results
Press Build the lines.
Blue: original · teal: parallel · gold: perpendicular · dot: the point.
2 The method
Parallel reuses m; perpendicular uses −1/m. Both plug the point into y = mx + b to find their own intercept.