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Mathematics 19 Online
OpenStudy (katherinesmith):

solve this equation by using the elimination method?

OpenStudy (katherinesmith):

2x + 3y = 18 5x – y = 11

OpenStudy (katherinesmith):

@zepdrix

OpenStudy (anonymous):

Multiply the bottom eq by3. Then solve for x. 2x+ 3y=18 15x-3y=33

OpenStudy (anonymous):

What did u get for x?

OpenStudy (katherinesmith):

3

OpenStudy (anonymous):

Yes. Now substitute the 3 into the equations to get y

OpenStudy (katherinesmith):

y = 4

OpenStudy (anonymous):

Yes. Put your answer as an ordered pair. (3,4)

OpenStudy (katherinesmith):

can you help me with one more?

OpenStudy (anonymous):

Sure

OpenStudy (katherinesmith):

2x – 5y = 1 3x – 4y = -2

OpenStudy (anonymous):

Decide which to eliminate. X or y

OpenStudy (katherinesmith):

i don't know. i guess x?

OpenStudy (anonymous):

Ok. You'll need to multiply by 3 on the to eq. And -2 on the bottom. That way the x values will cancel out

OpenStudy (anonymous):

6x-15 = 3 -6x +8y=4

OpenStudy (katherinesmith):

how did you get "+8y"

OpenStudy (anonymous):

-2(-4)

OpenStudy (katherinesmith):

oh wait okay

OpenStudy (katherinesmith):

y = -1?

OpenStudy (anonymous):

Ye

OpenStudy (katherinesmith):

and x = -2?

OpenStudy (anonymous):

Yes

OpenStudy (anonymous):

Great. Understand?

OpenStudy (katherinesmith):

i think so. thank you.

OpenStudy (anonymous):

You're welcome

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