In: Advanced Math
T/F
1) The function f(x) = x1 − x2 + ... + (−1)n+1xn is a linear function, where x = (x1,...,xn).
2) The function f(x1,x2,x3,x4) = (x2,x1,x4,x3) is linear.
3) For a given matrix A and vector b, equation Ax = b always has a solution if A is wide
1) If and and is scalar, then
Therefore, is linear (TRUE).
2) If and and is scalar, then
Therefore, is linear (TRUE).
3) Consider the wide matrix
and the vector
If has a solution then we get
which means
But the first equation itself implies , so that the system above can not have any solution. Thus, the statement in question is FALSE.