# The cost (£C) to each passenger on a coach trip varies inversely as the number (N) going on the trip. If 36 people go, the cost to each is £6.50, how do you find a formula connecting C and N?

Jun 16, 2015

Inverse variations are of the form $x \cdot y = \text{constant}$
In this case $C \cdot N = \text{constant}$, so we can calculate the constant:
$C \cdot N = 6.50 \cdot 36 = 234 \to C = \frac{234}{N}$