a. If A is a 7 × 9 matrix with a two-dimensional null space, what is the rank of A?
b. Could a 6 × 9 matrix have a two-dimensional null space?
a. If A is a 7 × 9 matrix with a two-dimensional null space, what is the rank of A?
b. Could a 6 × 9 matrix have a two-dimensional null space?