Question

If d varies inversely as t, and d=20 when t=2, what is the value of t when d=-5?

Please show step by step:)

Answer 1

if d varies inversely, then
t = (1/d) * x
when d = 20 t =2
therefore x = 40
So,
t = (x/d)

Checking the formula
2 = (40/20) - formula is okay

So if d=-5 then
t = (40/-5)
t = -8