1.4 The Matrix Equation Ax=b

Question 1

product of A and x

Answer 1

the linear combination of the columns of A using the corresponding entries in x as weights

Question 2

matrix equation

Answer 2

Ax=b

Question 3

a set of vectors {v1…vp} in Rm spans/generates Rm if

Answer 3

every vector in Rm is a linear combination of v1…vp

Question 4

identity matrix

Answer 4

matrix with 1’s on the diagonals and 0’s elsewhere