Coordinate Geometry: Interpreting Graphs of Proportional Relationships

Draw a coordinate plane showing a graph of a proportional relationship. Start by placing three text input fields for entering the constant of proportionality, the x-value, and the y-value. Then construct a ray originating from the origin and extending into the first quadrant, representing the proportional function. The ray should pass through a point determined by the entered values, illustrating the direct variation. Clearly label the axes and grid, and make the ray and point update dynamically as the inputs change, demonstrating the linear relationship between variables.