Question

Choose the correct alternative.

If AX = B, where A = `[(-1, 2),(2, -1)], "B" = [(1),(1)]`, then X = _______

Options

• `[(3/5),(3/7)]`

• `[(7/3),(5/3)]`

• `[(1),(1)]`

• `[(1),(2)]`

Answer 1

AX = `[(-1, 2),(2, -1)] [(1),(1)]`

= `[(-1 + 2),(2 - 1)]`

= `[(1),(1)]`
= B

∴ X = `[(1),(1)]`.