Elimination Method

MR. BIGSBY'S MATH WORLD

Elimination Method

12/10/2015

29 Comments

Combine equations to eliminate one variable.

29 Comments

Erica

12/10/2015 12:49:54 pm

Interesting.

Taylor Hemingway

12/10/2015 01:37:49 pm

Amna

12/10/2015 02:05:44 pm

When do u know which method works best?idk with different problems?
I understand this book Bt need more time to practice

Mr. Bigsby

12/10/2015 06:59:12 pm

There is personal preference but you can also look at the equations and see which would be easiest. We are going to have a whole lesson on this Tuesday.

Emily Ritzes

12/10/2015 02:11:51 pm

Elimination method is pretty easy. I finally got to watch the video after NJHS and auditions... :)

Amna (Again)

12/10/2015 02:40:57 pm

I don't get home to do the elimination with both variables on the same side of the equal sign I am confused on the homework but I tried 4

Alexis Kahler

12/10/2015 02:43:55 pm

no word from the sponser??? are there any situations on the homework that there is no solution??? can you recognize if it is going to be parallel or constant????

Mr. Bigsby

12/10/2015 07:00:57 pm

Just like when solving with substitution, if both variables disappear and the remaining numbers do not equal, it means no solution. And if the remaining numbers do equal, it means infinite solutions.

Hazel Montgomery-Walsh

12/10/2015 03:18:55 pm

Comment- This video helped so much! It really clarified the exact question I had! While doing my homework, I went through the video step-by-step to solve! Thanks!

Question- I think I understand why...but why exactly do you have to multiply the ENTIRE equation when trying to make a number so that you can cancel it out? Why not just multiply everything that is on that SIDE of the equation?

Mr. Bigsby

12/10/2015 07:15:15 pm

That's great to hear!

For your question, think about a regular equation.

3+4 = 7

now if I add 5 to the left side it wont be equal anymore
3+4+5 = 7 <not true!

but if I add 5 to BOTH sides, then it stays equal
3+4+5 = 7+5
12=12

The same if I multiply one side by 2, I have to multiply both sides by 2. And since the 3+4 was there first, it is written as 2(3+4)
2(3+4) = 2(7)

Now I could add that 3+4 or distribute the 2
2(3) + 2(4) = 2(7)
6 + 8 = 14

The same EQUALITY PROPERTY applies when there are variables

3x + 7 = 10
can be changed to
2(3x + 7) = 2(10)

Remember the calculator container? If you take out a calculator on one side, it wont be balanced, so you have to take out a calculator on the other side also to make it balanced.

maddox

12/10/2015 04:02:07 pm

this is way easier than the sub method

Krissy

12/10/2015 05:31:53 pm

Hello, it's me.

Justin Maddox

12/10/2015 06:27:05 pm

These vids are much easier to understand then class itself. Thanks for taking time out of your days of to make them for us. Much Appreciated and those big numbers always make me feel like i did something wrong.

Mr. Bigsby

12/10/2015 07:03:30 pm

You're welcome. I am glad they help!

Georgia

12/10/2015 06:57:08 pm

interesting

Julianna

12/11/2015 04:28:20 am

Good video

Megan

12/11/2015 04:39:09 am

I like this better than the substitution method

Megan

12/11/2015 04:39:49 am

Viola

12/11/2015 01:47:13 pm

This method is the easiest for me to use so far :D

no why did I put that there

Zoe

12/14/2015 06:06:55 pm

This website doesnt like me

Logan Nix

12/14/2015 07:58:13 pm

I understand this better now

isaiah

12/15/2015 11:34:49 am

just watched makes a lot of sense now to plug it back in

Jaelyn

12/16/2015 06:08:05 pm

Ethan Anderson

12/21/2015 08:41:21 pm

good job on the videos

Fletcher Thomas

12/22/2015 07:22:58 pm

cool video it make more since thanks mr bigsby

Sarina

1/7/2016 04:53:09 am

Karli

1/7/2016 01:34:31 pm

One video I'm missing

Krissy

1/13/2016 04:34:17 pm

I'm asking this question because
1. Extra credit (PLEASE 😭)
2. I need help

Question: When we work with fractions do we follow the same steps? Because my tutor is helping me with fractions and I'm really confused. I always end up with repeating decimals. I know we did this in class but I had my group members help me (a lot). Please answer me because I'm struggling a lot with this.

Ex:
{-1/10x+1/2y=4/5
{1/7x+1/3y=-2/21

Ally

2/7/2016 07:07:00 pm

Good video

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Elimination Method

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