Question

Which of the following operators in R3 are linear?
A) L(x)=(9x2,-5x3,-3x1)T
B) L(x)=(-4x1 , 7x1 , 5x1)T
C) L(x)=(6x1-7x2+4x3 , 10x2-3x3 , -9x1-9x2)T
D) L(x)=(2 , 8 , 9)T
E) L(x)=(x22, x3 , x1)T