diff --git a/Week 3/Week 3 - Practice Assigment Solutions.ipynb b/Week 3/Week 3 - Practice Assigment Solutions.ipynb
index 281db67..e31d597 100644
--- a/Week 3/Week 3 - Practice Assigment Solutions.ipynb	
+++ b/Week 3/Week 3 - Practice Assigment Solutions.ipynb	
@@ -64,10 +64,10 @@
     "y_sum = sum(y_i)\n",
     "x_squared_sum = sum([x_coord**2 for x_coord in x_i])\n",
     "\n",
-    "denom = n * x_squared_sum + x_sum ** 2\n",
+    "denom = n * x_squared_sum - x_sum ** 2\n",
     "\n",
     "if denom != 0:\n",
-    "    slope = (n * product_sum + x_sum * y_sum) / denom\n",
+    "    slope = (n * product_sum - x_sum * y_sum) / denom\n",
     "    y_intercept = y_sum / n - slope * x_sum / n\n",
     "    best_fit_y = [slope * x + y_intercept for x in x_i]\n",
     "    print(\"The best fit line is : \", \" y = \", slope, \"x + \", y_intercept)\n",