The document defines the x-intercept and y-intercept of a graph. The x-intercept is the x-coordinate where the line or curve crosses the x-axis, when y is equal to 0. The y-intercept is the y-coordinate where the line or curve crosses the y-axis. It provides an example of how to find the y-intercept and x-intercept from the equation of a line, y=mx+b, by plugging in values for x and y and solving for b and x, respectively.