Determine which of the following relations are functions and create equations.
a) the relation between earnings and sales if olwen earns $400 per week plus 5% commission on sales
b) the relation between distance and time if brian walks at 5km/h
i said they are both functions and created the first equation e=.05s+400 where e=weekly earnings and s=weekly sales. i don't know the second equation, though. for the .