Now let us increase the number of nodes by one 4S nodel:3(u1-U2)+4U1-u3)=-8-3 7U1-3U2-4U3=-11 2S nde2:3(u2-u1)+2(2-U3)+12=3 8A -3U,+6U,-2U2=3 IS ode 5U3+2{U3-U2)+4(U3-01)=25 254 r-4U,-20,+11U,=25 Ref By cramer s rule and determinants, we have 11-3-4 25 211191 2 L 3-4191 36 2112 : 3( ) 2( ) 1 3 node  2 −1 +  2 − 3 +  2 = 3 : 5 2( ) 4( ) 25 node 3 + 3 −2 + 3 −1 = 7 3 4 11 or 1 − 2 − 3 = − 3 6 2 3 or − 1 + 2 − 3 = 4 2 11 25 or − 1 − 2 + 3 = By Cramer' s rule and determinants, we have 1 191 191 4 2 11 3 6 2 7 3 4 25 2 11 3 6 2 11 3 4 1 = = − − − − − − − − − − −  = 2 = 2 and 3 = 3 Now let us increase the number of nodes by one. 1 3 4 8 3 node : (1 − 2 )+ (1 − 3 ) = − − 1  2  3 − 25A −8A − 3A 1S 5S 4S 3S 2S Re f