Answer the following questions and please write the process clearly.

QUESTION 13 + It is known that vectors of the form a+y 1 (where a, b, and y are parameters) lie in the null space of the matrix 3 -1 2 0 -1 1 -21 0 1 1 2 What is the value of a +B+y? Report your answer as a decimal. QUESTION 14 What is the rank of the matrix 2 0 -1 3 1 A = -4 O 4 -2 6 4 0 -34 -2