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Mathematics 10 Online
OpenStudy (anonymous):

Solve the system using the elimination method. 3x-4y=12 6x+2y=-11

RhondaSommer (rhondasommer):

multiply the first equation by -2

RhondaSommer (rhondasommer):

giving you....?

OpenStudy (anonymous):

-6x+8y=-22

RhondaSommer (rhondasommer):

which takes out ...?

RhondaSommer (rhondasommer):

the -6x and 6x in the equations :)

OpenStudy (anonymous):

Actually it would be -24 my b

RhondaSommer (rhondasommer):

it okay :)

RhondaSommer (rhondasommer):

so now you have 8y=-24

OpenStudy (anonymous):

making x=3.5. That's what I kept getting. I just felt like it was wrong.

RhondaSommer (rhondasommer):

plug it back in and get y

RhondaSommer (rhondasommer):

once you get y you can get the proportionate to the second equation :)

RhondaSommer (rhondasommer):

also, you could reverse it and multiply the second equation by -2

OpenStudy (anonymous):

Wait a minute. y=-3.5? because the x' cancel?

RhondaSommer (rhondasommer):

you have to combine like terms first sorry

OpenStudy (triciaal):

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