Question

y varies inversely with x, and x = -250 when y = 4. Find the inverse variation equation and use it to find the value of y when x = 25.
Answer

-40

-0.4

-25,000

-5

Answer 1

xy = k, where k is constant of proportionality
When x = -250, y = 4
-250(4) = k i.e. k = -1000
xy = -1000
When x = 25
25y = -1000
y = -40