So if the i-th slack variable of the primal is not really zero, then the i-th variable of the twin is equal to zero. Also, In the event the j-th slack variable of the dual is just not zero, then the j-th variable from the primal is equal to zero. https://lanezwfdi.tribunablog.com/little-known-facts-about-can-someone-do-my-linear-programming-assignment-41989086