A quantity x varies directly with y and inversely with z. Which expression represents the constant of variation, k?
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A quantity x varies directly with y and inversely with z. Which expression represents the constant of variation, k?
xz/y
xy/z
z/xy
y/xz
Answered by
0
This is a question on joint variation.
Direct variation is as follows :
x varies directly as y is written as follows :
x/y = k
x varies inversely as z is written as follows :
xz = k
now in both cases :
x = yk and x = k/z respectively.
Combining the two we have :
x = ky/z
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