diff --git a/topics/number_line.py b/topics/number_line.py
index 9d02286c..3848feba 100644
--- a/topics/number_line.py
+++ b/topics/number_line.py
@@ -120,6 +120,9 @@ class NumberLine(VMobject):
             result.add(mob)
         return result
 
+    def get_labels(self):
+        return self.get_number_mobjects()
+
     def add_numbers(self, *numbers, **kwargs):
         self.numbers = self.get_number_mobjects(
             *numbers, **kwargs
@@ -219,29 +222,7 @@ class Axes(VGroup):
         return graph
 
     def input_to_graph_point(self, x, graph):
-        if hasattr(graph, "underlying_function"):
-            return self.coords_to_point(x, graph.underlying_function(x))
-        else:
-            #binary search
-            lh, rh = 0, 1
-            while abs(lh - rh) > 0.001:
-                mh = np.mean([lh, rh])
-                hands = [lh, mh, rh]
-                points = map(graph.point_from_proportion, hands)
-                lx, mx, rx = map(self.x_axis.point_to_number, points)
-                if lx <= x and rx >= x:
-                    if mx > x:
-                        rh = mh
-                    else:
-                        lh = mh
-                elif lx <= x and rx <= x:
-                    return points[2]
-                elif lx >= x and rx >= x:
-                    return points[0]
-                elif lx > x and rx < x:
-                    lh, rh = rh, lh
-            return points[1]
-
+        return self.coords_to_point(x, graph.underlying_function(x))
 
 class ThreeDAxes(Axes):
     CONFIG = {