Update README.md

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

Author: FabianaCampanari

README.md

@@ -637,6 +637,18 @@ x_1 \geq 0 \text{ e } x_2 \geq 0
 
 <br>
 
+$  
+\left\{
+\begin{aligned}
+x_1 + 3x_2 + s_1 &= 7 \\
+2x_1 + 2x_2 + s_2 &= 8 \\
+x_1 + x_2 + s_3 &= 3 \\
+x_2 + s_4 &= 2 \\
+x_1,\ x_2,\ s_1,\ s_2,\ s_3,\ s_4 &\geq 0
+\end{aligned}
+\right.
+$
+
 SS
 \[
 \left\{