Final answer:
A budget line shows the possible combinations of two goods that are affordable given a consumer's limited income.
Step-by-step explanation:
A budget line shows the possible combinations of two goods that are affordable given a consumer's limited income. It represents the different combinations of goods that a consumer can purchase with a given budget. For example, if a consumer has $100 to spend and apples cost $2 each and oranges cost $1 each, the budget line would show that the consumer can afford to buy 50 apples or 100 oranges or any combination in between.