--- a/lstsq/questions.rst	Thu Oct 14 14:11:54 2010 +0530
+++ b/lstsq/questions.rst	Mon Oct 18 21:11:34 2010 +0530
@@ -8,6 +8,8 @@
    #. [1.0, 1.0, 1.0]
    #. Error
    
+   Answer: array([1, 1, 1])
+   
  2. What does ones_like([1.2, 3, 4, 5]) produce
 
    a. [1.2, 3, 4, 5]
@@ -15,4 +17,16 @@
    #. array([1, 1, 1, 1])
    #. array([1.2, 3, 4, 5])
 
+   Answer: array([1.0, 1.0, 1.0, 1.0])
 
+ 3. The plot of ``u`` vs ``v`` is a bunch of scattered points that show a
+    linear trend. How do you find the least square fit line of ``u`` vs ``v``.
+
+   Answer::
+
+      A = array(u, ones_like(u)).T
+      result = lstsq(A, v)
+      m, c = result[0]
+
+      lst_line = m * u + c
+