Community Answer

Let a_(1)=[[2],[-2],[-1]]quada_(2)=[[-3],[-3],[0]]soutionA=[[2,-3],[-2,-3],[-1,0]] be the matrin with a_(1) and a_(2) as column.The projection matrix is P=A(A^(TT)A^(-1)*A^(TT):}{:[A^(TT)*A=[[2,-2,-1],[-3,-3,0]][[2,-3],[-2,-3],[-1,0]]],[=[[9,0],[0,18]]],[:'(A^(TT)A^(-1)=(1)/(ad-b)[[d,-b],[-c,a]]:}],[(A^(TT)*A)^(-1)=(1)/(162)[[18,0],[0,9]]],[P=A*(A^(TT)A)^(- ... See the full answer