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Mathematics 11 Online
OpenStudy (anonymous):

someone please help me solve this system of equations x − 2y = 14 x + 3y = 9

OpenStudy (mertsj):

Multiply the second equation by -1 and add the result to the first equation. Then solve the resulting equation for y

OpenStudy (anonymous):

how do I do that? I don't understand

OpenStudy (anonymous):

y= -1 and x=11 (:

OpenStudy (mertsj):

You don't know how to multiply by -1?

OpenStudy (anonymous):

umm the entire equation by negative one? no..

OpenStudy (anonymous):

Do you understand where that came from?

OpenStudy (mertsj):

What is x times -1?

OpenStudy (anonymous):

-1x

OpenStudy (mertsj):

What is 3y times -1 ?

OpenStudy (anonymous):

-3y

OpenStudy (mertsj):

What is 9 times -1 ?

OpenStudy (anonymous):

-9

OpenStudy (mertsj):

What is x +3y=9 times -1 ?

OpenStudy (anonymous):

-1x-3y=-9

OpenStudy (mertsj):

Add that to the first equation.

OpenStudy (anonymous):

im solving it and the trouble im having is where I get to -5y=1x=3

OpenStudy (anonymous):

-5y=1x+3*

OpenStudy (mertsj):

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