Solution;
To prove that T is a linear transformation,we have to show that it preserves vector addition and scalar multiplication.
Let (x1,x2,x3),(y1,y2,y3) ϵR3
and a,b are scalar quantities such that ;
a(x1,x2,x3)+b(y2,y2,y3)=(ax1+by1,ax2+by2,ax3+by3)
Hence;[a(x1,x2,x3)+b(y1,y2,y3)]=T(ax1+by1,ax2+by2,ax3+by3)=((ax1+by1+ax2+by2+ax3+by3),(ax2+by2+ax3+by3))
=(a(x1+x2+x3)+b(y1+y2+y3)),a(x2+x3)+b(y2+y3))
=a(x1+x2+x3,x2+x3)+b(y1+y2+y3,y2+y3)
=aT(x1,x2,x3)+bT(y1,y2,y3)
Therefore T is a linear transformation.
To find Rank and nullity,
Write the coefficient matrix of the transformation,
T⎣⎡111⎦⎤ =[101111]
The reduced row achelon form is;
[100101]
The rank of the transformation is equal to the number of non- zero rows;
Rank(T)=2
Nullity of T can be found using the Rank Nullity theorem;
Nullity(T)=Domain(T)-Rank(T)=3-2=1
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