Algebra 36 - Solving Systems of Equations by Substitution

A system of two equations in x and y can be solved by rearranging one equation to represent x in terms of y, and then substituting this expression for x into the other equation to create an equation with only the variable y. This equation can then be solved to find y's value which can then be substituted back into either equation to find the value of x.

[droopy_]

Math is gloriously beautiful. Finding good teachers is hard- almost impossible when trying to do so for free- but here we are!! Thank you team and Steve Goldman for making this possible. This is probably the best algebra corner on the internet.

[FINGERSM]

This really helps me out, since my teacher teaches a bit too fast.

[ceeeceee]

That's one hell of a name, professor.

[pwnerjenkins]

these have been the absolute most helpful math videos, please keep them coming

[MrSupernova]

Great job explaining this concept! Could not be more clear. Thank you!

[kuiperion]

FINALLY A METHOD THAT IS EASY TO APLLY

[domoamadi]

This was good, it helped me remember something I learned 3 months ago

[catherineferris]

Definitely including this video in my lesson plan for my kiddos! You just gained a subscriber, thanks!!

[dylanb]

very helpful videos ! great animation quality as well, very impressed !

[kirablack]

This is perfect! I'm going to be going to a primary school with my friends to teach year 6's year 7 work.

[abhinoorsingh]

How did you teach me this. I couldn’t even understand it in school. Thank you

[rachelmarander]

Before the race, hare injected speed and mutilated the tortoise.

[Pranay_Maini]

At 3:16 can’t you just subtract 4x from both sides and get the same answer

[markezjohnson]

wait a second why do you multiply both numbers by two.

[kailanavargas]

Mmmmkay. Wait!!! What if neither of the equations are equal to a variable? In the video, there's y=2x-8 and y=1/2x but what if there's something like 2x-5=3y+10 and 7y=3x-22. Then what do I

[malikclowers]

thanks and I subscribed and I need a little more help great video

[jefferybrown]

Thank you so much! Now i understand this. :)

[minibanana]

Taught better than my fkn algebra teacher

[jheybrent]

Can you also substitute 2x-8 instead of the 1/2x?

[patricktrayford]

Thanks so much now i understand this !