Let's say that the given expression represents the cost of manufacturing a product, which is composed of two raw materials x and y.
The cost of x is $14 each unit, the cost of y is $3 each unit, and there is a fix cost (say it is the rent) of $250.
the coefficients are 14 and 3 (costs of x and y, respectively)
the variables are x and y (number of units of x and y)
the constant is 250 (fix rent)
