Hello! I came across a probem that I'm stuck on! It is If x+1y=1 and y+1z=1, what is the value of the product xyz?
Do you have to expand or square it! Thanks!
x + 1/y = 1
x = 1 - 1/y = [ y - 1] / y
And
y + 1/z = 1
1/z = 1 - y which implies that
z = 1 / [ 1 - y]
So x y z =
( [ y - 1] / y ) * y * [ 1 / ( 1 - y) ] =
[ y - 1 ] * [ 1 / (1 - y) ] =
-1 ( 1 - y) * [ 1 / (1 - y) ] =
-1
Thank you, CPhill! I understand it better, now!
+847 
