Can Anyone Answer anyone of these ? Q1) why direct SOLUTION of Load Flow Studie

Can Anyone Answer anyone of these ?
Q1) why direct SOLUTION of Load Flow Studies in Not Possile ?
Q2)Why majority of Buses in power system are load buses
Q3)Why one of the buses in Power system is taken as reference bus (slack or swing) Bus ?
Q4)Bus Admittance Matrix is a sparce (means it contains some zero elements ) matrix , give reason

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