Question

can you walk me step by step through any elimination equation???

Answer 1

help pleaseeee!!!!

Answer 2

Sure, lay it on us!

Answer 3

Yup. waiting :3

Answer 4

any equation i just need to understand it so i can do good. can u make one up?

Answer 5

Let's say you are asked to solve the following system of equations using the elimination method:
x + 3y = 40
3x - y = 30

Answer 6

ok
so i have to gat rid of one of the ys or xs right?

Answer 7

To solve using the elimination method, you need to exactly what its name implies; you need to eliminate a variable. The way that is done is by adding the equations together.

Answer 8

4x=2y =70

Answer 9

Yes. As the equations are written, if you add them together, x + 3x = 4x. That does not eliminate x.
Also, 3y + (-y ) = 2y. That does not eliminate y.

Answer 10

opps 1st equal sign is soposed to be a+

Answer 11

But notice that the y terms, 3y and -y already have opposite signs. If you could change the -y into -3y, then the addition would eliminate the y's.

Answer 12

oh so you multiply the whole equation by 3?

Answer 13

oh ok. then i solve by divding them i imput it into one of the equations right?

Answer 14

What we do is we multiply the entire second equation by 3 to get the -3y we need.
Let's rewrite the first equation followed by the second equation multiplied by 3 on both sides. Then we add the equations.
x + 3y = 40
9x - 3y = 90
------------- (add)
10x = 130

Answer 15

Now you can easily solve for x:
10x = 130
x = 13
Now insert 13 for x into one of the original equations to get y.
Let's use the first equation:
x + 3y = 40
13 + 3y = 40
3y = 27
y = 9
Solution: x = 13, y = 9

Answer 16

after you divide both sides by 10 you plug x into an equation and you get y?

Answer 17

In this example, one equation had to multiplied by a factor to get a variable to get eliminated. In some cases, there is no need to multiply either equation, and in other cases, you need to multiply both equations by different factors to eliminate a variable.

Answer 18

Yes, that's correct.

Answer 19

ok :) thanks sooo much! i didnt understand it before so thnx! ill do good on the test :) thnx again

Answer 20

thnx i have to go ill give u a medal!