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Post a New Question | Current Questions | Chat With Live Tutors
Posted by Sarah on Thursday, September 24, 2009 at 7:49pm.
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If x/y=4, x-y=9, and y-x=-9, what is x & y?
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- 8th Grade Math - MathMate, Thursday, September 24, 2009 at 9:08pm
x/y=4, means x=4y
substitute 4y for x in x-y=9
to get
(4y)-y = 9
Can you continue?
Note: the third equation (y-x)=-9 can be derived from the second (x-y)=9, so it gives no new information.
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