Question

x and y vary inversely, and x = 21 when y = 3. What is the value of k?
A. 1 7
B. 1 3
C.
7
D.
63

Answer 1

In an inverse relation, this is true:\[xy = k\]

Answer 2

That is true for ALL \(x\) and \(y\). So you simply have to multiply \(21\) and \(3\).

Answer 3

thanks for the help

Answer 4

You're welcome =)