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Mathematics 21 Online
OpenStudy (anonymous):

2x+7y=-3 -9x+y=46

OpenStudy (anonymous):

too many equal signs

OpenStudy (anonymous):

oh my fault i see \[2x+7y=-3\] \[-9x+y=46\] sorry

OpenStudy (anonymous):

you want elimination or substitution ?

OpenStudy (anonymous):

Substitution

OpenStudy (anonymous):

then solve second equation for y, because it is easiest \[-9x+y=46\] \[y=9x+46\] and substitute into first equation

OpenStudy (anonymous):

2x+7y=-3 (*9) -----> 18x+63y=-27 -9x+y=46 (*2) -----> -18x+2y=92 <=> 65y=65 <=>y=1

OpenStudy (anonymous):

2x+7*1=-3 => 2x=-10 => x=-5

OpenStudy (anonymous):

You are welcome :p

OpenStudy (anonymous):

\[2x+7y=-3\] \[2x+7(9x+46)=-3\] \[65x+322=-3\] \[65x=-325\] \[x=-5\]

OpenStudy (anonymous):

the find y by substitution. Alexis got right answer using elimination. doesn't matter which you use

OpenStudy (anonymous):

We are both great ^^

OpenStudy (anonymous):

Yes, You both are. I just wish I could understand this better... still confused :/

OpenStudy (anonymous):

what would an ordered pair be?

OpenStudy (anonymous):

Just write what I am writing and if you still have any questions tell me.

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