Question 936422: Hi, could someone please help me with this problem? I'm quite stuck.
The trouble for me here relies on the meaning of this symbol: "#" Could you tell me what that means? And moreover, how can or does it apply to the following problem?
Let x#y=2x-3y and x*y=x-y. If x=10 and y=12, evaluate (x#y)*y.
Thank you in advance,
Marcelino
Answer by ptaylor(2198)   (Show Source):
You can put this solution on YOUR website! OK. This problem has defined the expression x#y to equal 2x-3y and x*y to equal x-y. The problem could just as easily defined the expression x$y to equal 2x-3y and x^^y to equal x-y. So, the way I see it, the symbols # and * mean nothing at all.
Now it seems to me like (x#y)*y would equal (x#y)-y and (x#y) would equal 2x-3y. Sooo we have (x#y)*y=2x-3y-y=2x-4y
substitute x=10 and y=12 we have
(x#y)*y=2(10)-4(12)=-28
Does this help?---ptaylor
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