Posted by **mdan** on Tuesday, October 15, 2013 at 11:54am.

Write the system as a matrix equation and solve using inverses.

x1 + 2x2 - x3 = -3

-2x1 - x2 + 3x3 = 0

-4x1 + 4x2 - x3 = -12

A. x1 = 2, x2 = -3, x3 = 1

B. x1 = 1, x2 = -2, x3 = 1

C. x1 = 1, x2 = -2, x3 = 0

D. x1 = 1, x2 = -3, x3 = 1

- maths -
**mdan**, Tuesday, October 15, 2013 at 11:54am
this one seems difficult...plz help

- maths -
**Steve**, Tuesday, October 15, 2013 at 12:10pm
You have an equation AX=B

where

A =

(1 2 -3)

(-2 -1 3)

(-4 4 -1)

and

B =

(-3)

(0)

(-12)

A^{-1} = 1/3 times

(11 10 -3)

(14 13 -3)

(12 12 -3)

So, X = A^{-1}B = (1,-2,0)

- maths -
**mdan**, Tuesday, October 15, 2013 at 12:32pm
fabulous

## Answer This Question

## Related Questions

- Linear Algebra - Solve the following system using Gauss's algorithm (a) x1 + 2x2...
- math,help - this is from another section one of the problems can someone help me...
- Math - Maximize P= 8x1+12x2 Subject to 2x1+4x2<=24 3x1+3x2<=21 4x1+2x2<...
- Linear Programming - calculate the lower bound from min z= 4x1 + 2x2 2x1 - 3x2...
- Math - Find the augmented matrix for each of the following systems of linear ...
- Math: Please check my answers - 1. What is the degree of the monomial 3x2y3? 2 3...
- Math - Use the simplex meth to solve the linear programming problem Maximize z...
- Math "Need Help Asap"! - Please Help Me !!!!!! 1. Polynomials Add or subtract (...
- Algebra help! - 1.) Solve the system by triangularizing the augmented matrix and...
- linear algebra - If possible, solve the following linear systems by Cramer's ...

More Related Questions