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- anonymous

Solve using the addition method
2x -3y=8
3x+2y=-1

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- anonymous

Solve using the addition method
2x -3y=8
3x+2y=-1

- schrodinger

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- anonymous

multiply one equation by 2, and the other by three and then add or subtract the terms that have equal coefficients (you will be left with one variable, then solve for that variable and plug it into one of the original equations to get the other variable

- anonymous

@killabarbie
that doesnt help you any because it still has two different variables in it

- anonymous

Multiply the first line by 2
multiply the second line by 3
4x -6y = 16
9x +6y = -3
The y's cancel out so you're left with
11x = 13
x = 13/11
then you can sub x into either equation and get y = -25/11

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- anonymous

Using matrices is long and time consuming, so dont use them.

- anonymous

i couldve sworn i saw a big matrix displayed on the screen by lagrangeson

- anonymous

anyone else see it? it isnt there anymore...

- anonymous

Matricies is much easier actually in my opinion. also i made an error in my first calculation..

- anonymous

bt you have to draw them, and then, plug the numbers in... i just dont like them because you draw out the matrix

- anonymous

Trying to remember how to use matrices. Mind refreshing my memory?

- anonymous

sorry ive been doing some exam studying, and I worked this equation out on paper, and the x = 1 y = -2

- anonymous

Mridrik, erm I have a personal way of handling matricies that on plain paper looks longer than substitution or elimination, but with this method, u can mentally figure it out much quicker. I'll try and write an outline of it for you.

- anonymous

thanks

- anonymous

Alright so I would first set it up as a matrix.
[2 -3 8]
[3 2 -1]
Then i would use the x values and split them to be infront of the ANS
and I just keep the y - ANS format the same
so i get
[8 2]
[-1 3] for x
______________
[-3 8]
[2 -1] for y
Now you divide it by the original X and Y's
[2 -3]
[3 2]
And u multiply it all out and get your answers for x and y.
so essentially its
[8 2]
[-1 3]
DIVIDE BY
[2 -3]
[3 2]
= y
and
[-3 8]
[2 -1]
DIVIDE BY
[2 -3]
[3 2]
= x

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