Let:
y = Total pay for one year
x = Number of computers you sell
You are paid $50 for each computer you sell, thus your income for commissions is 50x.
Adding this to the base salary gives your total pay:
y = 50x + 25,000
The expression above is the required function that represents your total pay for one year.
The variable x is the number of computers you sell, so it has the following restrictions:
* Cannot be negative
* Must be a whole number