diff --git a/mlclass-ex1/computeCostMulti.m b/mlclass-ex1/computeCostMulti.m
index d9a3d68..bec72e1 100644
--- a/mlclass-ex1/computeCostMulti.m
+++ b/mlclass-ex1/computeCostMulti.m
@@ -14,7 +14,7 @@
 %               You should set J to the cost.
 
 
-
+J = sum((X*theta - y).^2)/(2*m);
 
 
 % =========================================================================
diff --git a/mlclass-ex1/normalEqn.m b/mlclass-ex1/normalEqn.m
index d32cd8e..2c8c74a 100644
--- a/mlclass-ex1/normalEqn.m
+++ b/mlclass-ex1/normalEqn.m
@@ -12,7 +12,7 @@
 
 % ---------------------- Sample Solution ----------------------
 
-
+theta = pinv(X'*X)*(X'*y);
 
 
 % -------------------------------------------------------------