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Mathematics 20 Online
OpenStudy (anonymous):

Will Medal, Look in the Comments for the question

OpenStudy (anonymous):

OpenStudy (anonymous):

Does any one have any idea on how to solve this?

OpenStudy (anonymous):

@mathmale @ganeshie8 Please help

RhondaSommer (rhondasommer):

i do!

OpenStudy (anonymous):

Please explain! I am desprate

RhondaSommer (rhondasommer):

I will give me a second

OpenStudy (anonymous):

Ok, This was as far as I got \[x=\frac{ 7+9y }{ 4 }\] and \[y=\frac{ 8+4x }{ 6 }\]

RhondaSommer (rhondasommer):

nooooo

RhondaSommer (rhondasommer):

i dont think you know how to solve these equations...

RhondaSommer (rhondasommer):

4x - 9y = 7 -4x +6y = 8

OpenStudy (anonymous):

My teachers suck.

RhondaSommer (rhondasommer):

looking at these equations, 4x and -4x cancel each other out

RhondaSommer (rhondasommer):

(we're combining the equations together)

OpenStudy (anonymous):

OHHHHH, ok Haha, I think I know what I was doing wrong, but continue.

RhondaSommer (rhondasommer):

-9y + 6y = -3y

RhondaSommer (rhondasommer):

7+8 = 15

RhondaSommer (rhondasommer):

-3y = 15 divide each side by -3 y = ?

OpenStudy (anonymous):

-5

RhondaSommer (rhondasommer):

and that is your "y"

RhondaSommer (rhondasommer):

so which of all the options offers -5 as the y?

RhondaSommer (rhondasommer):

thats your answer :)

OpenStudy (anonymous):

OHHHH, ok, that makes so much more sense!!! I understand what I was doing wrong now. So that makes A. the correct answer

RhondaSommer (rhondasommer):

yup :)

OpenStudy (anonymous):

Thank you, my teachers...which are videos suck at teaching.

RhondaSommer (rhondasommer):

normally you would place your "y" into the equation and get x as well but that question didn't have two answers were "y" equaled -5 :)

OpenStudy (anonymous):

Yeah, that makes sense, thank you so much!

RhondaSommer (rhondasommer):

no prob :P

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