y-intercept

The y-intercept is the point where a graph of a line crosses the vertical y-axis. It represents the value of the dependent variable (y) when the independent variable (x) is zero. In practical terms, if you think of a graph modeling a real-world situation, the y-intercept shows the starting value or initial condition before any change occurs. For example, if a line models total cost and the y-intercept is $50, it indicates a fixed starting fee or fixed cost that is incurred even if no units are produced.