what is budget line in economics

In economics, a budget line is a graphical representation of all possible combinations of two goods that can be purchased with a given income and prices, such that the cost of each of these combinations is equal to the money income of the consumer. The budget line shows the maximum amount of one good that can be purchased for each possible quantity of the other good, given the consumers income and the prices of the two goods. The slope of the budget line represents the relative price of the good on the horizontal axis in terms of the good on the vertical axis. The budget line is an important concept in consumer theory, as it helps to determine the optimal consumption bundle for a consumer given their income and the prices of the goods they wish to purchase.