SOLUTION: 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

Algebra ->  Functions -> SOLUTION: 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       Log On


   



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


Answer by Mathtut(3670) About Me  (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)
highlight%28y=12%2F20=3%2F5%29

another way of doing this is to set up a proportion of y%5B1%5D%2Fy%5B2%5D=x%5B2%5D%2Fx%5B1%5D
an inverted relationship proportion