Can I get help on the 15th question from this link?

https://docs.google.com/file/d/0ByXp6Ibu-fCyOTBhMmE5MjgtN2U2Yy00YWI1LThmNDQtZjAzOWVmMTdmNjc1/edit?pli=1

hello there welcome to study pool!

2x-9y=15----------------(1)

3x-2y=11---------------(2)

(1)*3-(2)*2

6x-27y-6x+4y=45-22

-23y=23

y=-1

from (1)

2x-9*(-1)=15

2x=15-9

x=6/2

x=3

so y=-1 and x=3

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I don't understand how you've got the first part.

sorry i'll do it again for you

i multifly the first equation by 3

then we got

3*2x-9y*3=15*3

simplify

6x-27y=45------------(3)

and also i have multiflied 2nd equation by 2

3x*2-2y*2=11*2

6x-4y=22-----------------(4)

then i have substract (4) by (3)

6x-27y-6x-4y=45-22

got it now?

still have any doubt ?

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