**9. In each part, determine whether the given 3-tuple is a solution of the linear system**

‘For each part put the values of x1, x2 and x3 a

test whether the values equals the all ones vector in RHS or not. The matrix

The vetor in part (a) is x=(3, 1, 1).

Ax = (1, 1, 1). Hence (3, 1, 1) is a **solution**.

Ax = (9, 7, 11) # (1, 1, 1). Hence (b) is **not solution**.

Ax = (4, 0, 8) # (1, 1, 1). Hence (c) is **not solution**.

Ax = (1, 1, 1) = (1, 1, 1). Hence (d) is a **solution.**

Ax = (1, 1, 1) = (1, 1, 1). Hence (e) is a **solution.**