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drawing a figure will help, could u draw a figure of this ?

|dw:1353637103770:dw|

|dw:1353579949506:dw|

volume = 3(x-6)(y-6) = 756

can u solve those 2 equations ?
xy=486
3(x-6)(y-6) = 756
?

cAN I DO the substitution method?

x = 486/y
then substitute to the second equation

try it, if u go wrong, i'll help....
instead substitute xy=486 in 2nd equation

u get xy term in 2nd equation

and u'll be able to find x+y from 2nd equation...

18y^2-810y+8748
very big numbers >.<

y^2-45y+486

if 18y^2-810y+8748 is correct... i have not checked that.

y^2-45y+486 =0 is correct
can u factor it ?

hint : 18*27 = 486

y^2-45y+486 =0
(y-18)(y-27)=0

find y from here, then u also get 2 values of x
then dimensions are x,y

you're a very big help to me my friend. thanks a lot :)