Question

A local store makes and sells handmade ceramic cookware. The store earns profit of one dollar more on each plate sold than it earns by selling one cup. If the profit the store earns on one day on the sales of cups and plates is given by the expression ,
kx+(k-1)y, what does y represent if k is the profit earned from selling each plate?

A. The number of cups sold in one day.

B. The number of plates sold in one day.

C. The profit earned on the cups sold in one day.

D. The profit earned on the plates sold in one day.

Answer 1

The equation for profit is expected to be
  daily profit = (profit on plate)*(number of plates) +(profit on cup)*(number of cups)

We are told that
  profit on plate = k
  profit on cup = k-1
Matching these to the expression above, we find
  x = number of plates
  y = number of cups

You are asked what y represents. It is
  A. The number of cups sold in one day.