Mathematics
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OpenStudy (casadie1004):
Please help, will medal and fan!!!
For the following system of equations what is the x value of the solution?
-x+2y=6
6y=x+18
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OpenStudy (anonymous):
ok that was wrong sorry
OpenStudy (anonymous):
you can write the first equation as \[x=2y-6\] substitute that in to the second and solve \[6y=2y-6+18\] for \(y\)
OpenStudy (anonymous):
did that help or no?
OpenStudy (casadie1004):
3?
OpenStudy (anonymous):
yes, \(y=3\) now you need to find \(x\)
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OpenStudy (casadie1004):
the question only asked for y, but thank u.
OpenStudy (anonymous):
actually it asked for x
OpenStudy (anonymous):
i mean that is what you wrote anyways
OpenStudy (casadie1004):
lol nvm ur right i was reading off of the wrong question on the test. how do i find x?
OpenStudy (anonymous):
you know that \[-x+2y=6\] and that \(y=3\) so you can solve \[-x+6=6\]for \(x\)
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OpenStudy (anonymous):
or, since \[6y=x+18\] you can solve \[18+x=18\] either way
OpenStudy (casadie1004):
0?
OpenStudy (anonymous):
yes, both times, which means it is certainly correct
OpenStudy (casadie1004):
Thank you! :)
OpenStudy (casadie1004):
Can you help me with one more?
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OpenStudy (anonymous):
sure
OpenStudy (casadie1004):
solve the following system of equations using substitution. what is the value of y.
2x+3y=105
x+2y=65
OpenStudy (casadie1004):
a.15
b.25
c.40
d.65
OpenStudy (anonymous):
here you can write the second one as \[x=65-2y\] and substitute in to the first to solve \[2(65-2y)+3y=105\]
OpenStudy (anonymous):
sorry got logged out
can you solve that one?
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OpenStudy (casadie1004):
yeah sorry i walked away from the computer, 1 second. almost done
OpenStudy (casadie1004):
y=25?
OpenStudy (anonymous):
oui
OpenStudy (casadie1004):
what?
OpenStudy (anonymous):
yes
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OpenStudy (casadie1004):
thank you!
OpenStudy (anonymous):
yw
OpenStudy (anonymous):
that it?
OpenStudy (casadie1004):
yes :)
OpenStudy (anonymous):
whew