Budget line and budget constraint?

the price of goods on the x axis in terms of the good on the y axis

A budget line is a line showing the alternative combinations of any two goods that a consumer can afford at given prices for the goods and a given level of income.

money income is fixed

operating budget pays for day-to-day expenses, like salaries of a state employee and capital budget pays for major capital, or investment, spending, like building a bridge the money comes from there.

A plan which predicts expenses and income for a specific period of time.