diff --git a/optimization202/Modeling_Session_1/exercise_set1.ipynb b/optimization202/Modeling_Session_1/exercise_set1.ipynb
index 2acca8f..e2b9424 100755
--- a/optimization202/Modeling_Session_1/exercise_set1.ipynb
+++ b/optimization202/Modeling_Session_1/exercise_set1.ipynb
@@ -97,11 +97,11 @@
     "\n",
     "> Part 2. \n",
     "\n",
-    "\\begin{align}\n",
-    "x_1 + x_2 + x_3 &= 6       \\\\\n",
-    "3x_1 + 2x_2 + x_3 &\\ge 20  \\\\\n",
+    "\\begin{align*}\n",
+    "x_1 + x_2 + x_3 &= 6 \\quad &(1)      \\\\\n",
+    "3x_1 + 2x_2 + x_3 &\\ge 20  \\quad &(2)\\\\\n",
     "x_1, x_2, x_3, &\\ge 0\n",
-    "\\end{align}\n",
+    "\\end{align*}\n",
     "\n",
     "**Q9.** Translate the following into constraints using binary variables for deciding to invest in three stocks. Then determine if they are compatible as above. \n",
     "\n",