0 Consider the transofrmation T : R3-+ R3 that projects vectors onto the line l-Jo | + ÈJo . IE R (a) Find a formula for Tand prove that T is a linear transformation. (b) Find matrix A, asssociated with T (c) Determine the relationship between the row space of A row(A) and the line l (d) Determine the null space, Null(A).