Completed all functions for the turtle graphing exercise.

transform.py

@@ -49,12 +49,15 @@ def ratio(value, start, end):
 
 def scale(value, domain_min, domain_max, range_min, range_max):
     "Given a value within a domain, returns the scaled equivalent within range."
-    raise NotImplementedError
+    #raise NotImplementedError
+    r = ratio(value, domain_min, domain_max)
+    return range_min + r * (range_max - range_min)
 
 def get_x_values(points):
     "Returns the first value for each point in points."
-    raise NotImplementedError
+    x_vals = points[0]
+    return x_vals
 
 def get_y_values(points):
-    "Returns the second value for each point in points."
-    raise NotImplementedError
+    y_vals = points[1]
+    return y_vals