<p>Sugar syrup is made by mixing together sugar and boiling water. The amount of boiling water needed (`y` liters) is directly proportional to the amount of sugar (`x` cups). </p> <linegraph data-props='{"options":{"x_min":0,"y_min":0,"y_max":16,"x_max":8,"cell_size":35,"x_interval":1,"y_interval":4,"x_label":"Amount of Sugar (cups)","y_label":"Amount of Water (liters) ","title":"Sugar Syrup Recipe","x_axis_name":"x","y_axis_name":"y"},"points":[{"id":0,"x":0,"y":0,"show_point":false,"highlight_point":false,"show_coordinates":false,"show_x_intercept":false,"show_y_intercept":false,"x_coordinate_highlight":true,"y_coordinate_highlight":true,"show_x_intercept_point":false,"show_y_intercept_point":false},{"id":1,"x":2,"y":4,"show_point":false,"highlight_point":false,"highlight_point_color":"#A3A3B3","show_coordinates":false,"x_coordinate_highlight":true,"y_coordinate_highlight":true,"show_x_intercept_point":false,"show_y_intercept_point":false,"show_x_intercept":false,"show_y_intercept":false},{"id":2,"x":8,"y":16,"show_point":false,"highlight_point":false,"highlight_point_color":"#A3A3B3","show_coordinates":false,"x_coordinate_highlight":true,"y_coordinate_highlight":true,"show_x_intercept_point":false,"show_y_intercept_point":false,"show_x_intercept":false,"show_y_intercept":false}],"line_segments":[{"first_point_id":0,"second_point_id":2,"show_start_arrow":false,"show_end_arrow":true,"highlight_line":"#A3A3B3"}]}'></linegraph> <p>Write an equation that represents the proportional relationship in this graph, for `y` in terms of `x`.</p>