Update README.md

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

Author: FabianaCampanari

README.md

@@ -635,6 +635,18 @@ x_1 \geq 0 \text{ e } x_2 \geq 0
 
 ### [The system becomes]():
 
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+$x_1 + 3x_2 + s_1 = 7$  
+$2x_1 + 2x_2 + s_2 = 8$  
+$x_1 + x_2 + s_3 = 3$  
+$x_2 + s_4 = 2$  
+$x_1,\ x_2,\ s_1,\ s_2,\ s_3,\ s_4 \geq 0$
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+<br>
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