Proof of Slopes of Perpendicular Lines

This video contains a proof that the product of the slopes of two lines that are perpendicular is equal to -1.

Follow us on Twitter: @Mathclix
Follow us on Instagram: @Mathclix

“Where Students DO MaTh!”

[squidy]

such a simple proof yet so effective. thank you!

[srinivasjsv]

If X-axis and y-axis are also perpendicular, so what is product of their slopes

[mememania]

Why aren't you still active on youtube? I really miss ya :(

[LagAttacktoSlay]

Non-general, and insufficient, methinks

[דוריתנגר-צו]

Hi great video, I would love to see proof to the contrary

[someoneotherthananne]

Thanks so much for this video, it's really helpful!

[alittax]

Thank you very much for this clear and beautiful explanation! I've liked the video and subscribed to your channel.

[alittax]

3:29 Is this m1-m2 because it's the distance between the 2 y coordinates?

[DANIELDALLAS_MATHs]

Yeah, good! Just use the transformation theory - > rotation 90 degrees

[davidriendl]

Thanks! I'm going to use this as an extension for my students after we review pythag!

[eumantrait]

What if we replace the X coordinate ( horizontal distance) with 2 or any number instead of 1? I tried so many times and didn't have the slope = -1. I've been struggling with this question for too long, please help me.

[saimalyadri]

m1 means X-axis slope, m2 means Y-axis slope