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Mathematics 21 Online
OpenStudy (anonymous):

8x-y=30 7x=8x-66

myininaya (myininaya):

Is your second equation right?

OpenStudy (anonymous):

yes

myininaya (myininaya):

Ok just making sure so you can actually solve he second equation for x

OpenStudy (cwrw238):

from 2nd equation x = 66 plug this into first 8(66) - 30 = y y = 498 x=66,y=498

myininaya (myininaya):

\[7x-8x=-66\] \[-1x=-66 => x=66\]

myininaya (myininaya):

lol cwrw already got it

OpenStudy (anonymous):

That is what I came up with to but the test answer was different

myininaya (myininaya):

Maybe it was a type-o i bet

myininaya (myininaya):

that one x is suppose to be a y

myininaya (myininaya):

i wonder if we pretend it was a y if we could find the solution it was looking for

OpenStudy (anonymous):

maybe \[7x=8y-66\] or \[7y=8x-66\]

OpenStudy (anonymous):

The answer was (3,-6)

hero (hero):

deanmary, you probably typed the equation wrong.

myininaya (myininaya):

He said it was right. It might have been a type-o on the test. That is always possible. You should totally tell your teacher deanmary so you don't get penalized for it.

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