Question

If D varies directly as s and D = 140, when S=35 find the relationship between D and S​

Answer 1

D = 4s

Explanation:

Given that D varies directly as s then the equation relating them is

D = ks ← k is the constant of variation

To find k use the condition D = 140 when s = 35

k =
`(D)/(s)` =
`(140)/(35)` = 4

D = 4s ← equation of variation