3-variable linear equations (part 1)

BlackSpiderWolf Says:

Jan 27, 2009 - Great videos, there helping me alot. But the next one has been removed? It was just getting good..

fewerbetterthanme Says:

Mar 24, 2009 - Very nice Very nice

kwestionEverything Says:

Jun 16, 2009 - please make anouther continuation of this vid. it is very helpful :)

hoyospetrola Says:

Jan 22, 2010 - thanks a million fron ireland!!!!!!!!!!!

kimcheolho Says:

Feb 26, 2010 - Thank you!!

MEGAXSTU Says:

Apr 24, 2010 - I usually zone out on 3 variable equations for some reason. Thanks for the helpful tutorial!

hugstablebear Says:

May 4, 2010 - Even if no two planes are parallel and no two planes are the same plane, 3 planes still don't necessarily intersect at a point. Take a card and fold it into a V-shape, then rest it on the table with the vertex uppermost, and you will see. Three planes, which contain a space shaped like a triangular prism will never intersect at a point but have 3 parallel lines of intersection; one between each pair. Three planes can also intersect in a line, edge on appearing like 3 lines intersecting a point.

PaksRhan Says:

Aug 23, 2010 - Sir isnt that if you will draw it, It will be in 4 quadrants? then why is it positive 8? since Z is in the Quadrant III, should it be negative? please explain Sir. thanks

MrJbrezzy Says:

Sep 16, 2010 - just to let you know your axis are mixed up. z axis should be the old y axis, the old x axis should be the y axis,and thex axis is the line tht crosses the two axis

schwartzxc13 Says:

Oct 8, 2010 - His name is Sal.

X02switchblade Says:

Oct 11, 2010 - for the next video go to khanacademy's channel and search for "linear algebra 3 unknown matrices"Infinite thanks to you Sal !Thanks to you I fell in love with Math once again!

LAnonHubbard Says:

Dec 7, 2010 - Brilliant!

slimfail2 Says:

Dec 23, 2010 - wow sal you blew my mind just that quick. ive been struggling with these and so have classmates i tutor, i can see it a little better now.

galapin26 Says:

Feb 3, 2011 - wrong the line that you are marking as Z is really X and the one that you are marking as X is really Y. Ohh and the one market as Y is really Z

nfwu Says:

Mar 19, 2011 - Either way is correct; it solely a matter of notation. Both systems as you describe them are right-handed. (Though whether you use left or right handed is also a matter of personal choice and/or your tutor's choice.)

petitemasochist Says:

Mar 30, 2011 - Oh what fun! I loved this! Ty! :)

illlluck Says:

May 30, 2011 - it can go either way. You can imagine it like a flipped box. some text books have z like the x and some text books have x instead of z

galapin26 Says:

May 30, 2011 - Yea but the way that he is teaching it IS NOT the usual way

DvdRC9702 Says:

Jul 15, 2011 - Stop being so stupid, for the love of God... Your mom is disappointed.

jgrabener Says:

Jul 20, 2011 - This is a great tutorial. I am curious about the software you are using to present this material. I really like this method and it works well for onlline learning.

rttr125 Says:

Oct 4, 2011 - i beg to differ, my text book says otherwise

Juanguiii13 Says:

Jan 17, 2012 - there's no second video!!!, what can we do, not even in the khan academy web page

ownage554 Says:

Jan 20, 2012 - I <3 maths

roberth214 Says:

Feb 4, 2012 - the usual way? Last I checked, there wasn't legislation that mandated the axes be presented in a particular way. It's really funny cause the dude in the video knows more about math than you ever will :)