Questions on Algebra: Functions, Domain, NOT graphing answered by real tutors!

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Question 167604: I have been trying to get this and am having trouble. is my answer correct?
If y varies inversley as x and y=1.5 when x=8, find y when x=20.
y=k/x
1.5 = k/20
(20) 1.5 = k
30 = k

: I have been trying to get this and am having trouble. is my answer correct?
If y varies inversley as x and y=1.5 when x=8, find y when x=20.
y=k/x
1.5 = k/20
(20) 1.5 = k
30 = k

Answer by Mathtut(1263) (Show Source):
You can put this solution on YOUR website!
so yx=k therefore 1.5(8)=12 so 12 is our constant k
now if you have x=20 and want to find y --->you must multiply x time y and make it equal to our constant. hence 20(y)=12(our constant)

another way of doing this is to set up a proportion of
an inverted relationship proportion