The equation "Y = 2X + 3" represents a linear relationship between two variables, Y and X. In this equation, Y is dependent on X, meaning its value changes based on X. The number 2 is the slope, indicating that for every increase of 1 in X, Y increases by 2. The number 3 is the y-intercept, which is the value of Y when X is 0. This equation can be graphed on a coordinate plane, where the horizontal axis represents X and the vertical axis represents Y. The line will rise steeply due to the slope of 2, starting at the point (0, 3) on the y-axis. This visual representation helps to understand how changes in X affect Y.