Question

If a varies inversely with b, and a=20 when b=14, find the equation that relates a and b.

Answer 1

ab = 280

or

a = 280/b

Explanation:

Inverse variation is of the form

xy = k

Since we have a and b as our variables

ab = k

20 *14 = k

280 = k

ab = 280

Sometimes they write it as

a = 280/b