Equations of Proportional Relationships . Relating Equations to Graphs Stefi likes smaller apple slices. The equation y = 9x represents the relationship between the number of apples, x, and the number of slices, y, she gets. Which graph represents the relationship? The graph shows the relationship between inches, x, and miles, y, on a map. Which equation represents the proportional relationship? y = 5x y = 1 y = x + 5 The graph shows the relationship between inches, x, and miles, y, on a map. Which equation represents the proportional relationship? y = x + 5 y = 5x y = 10