Update README.md

Signed-off-by: Fabiana 🚀  Campanari <113218619+FabianaCampanari@users.noreply.github.com>

Author: FabianaCampanari

README.md

@@ -215,8 +215,11 @@ The **graphical method** for solving simple linear programming (LP) problems inv
 - **[Constraints]():** These are linear inequalities or equalities that restrict the values the decision variables can take.
   - Equality constraint:
 
+  $$a_{i1}x_1 + a_{i2}x_2$$ = $$b_i$$
 
-     #### $$a_{i1}x_1 + a_{i2}x_2$$ = $$b_i$$
+  ```latex
+   a_{i1}x_1 + a_{i2}x_2 = b_i
+   ```
 
 
   <br>