Final answer:
The equation x + y = 3 represents a line on a graph. By considering different values of x and y that satisfy the equation, you can plot points and create a line.
Step-by-step explanation:
The equation x + y = 3 represents a line on a graph. In this equation, the coefficients of x and y are both 1. To find the graph, you can consider some points that satisfy the equation and plot them on the graph. For example, when x = 0, y = 3, and when y = 0, x = 3. By connecting these points, you will get a line.