Q. 4.76 - Intermediate Algebra

Question

Write the system of equations that corresponds to the augmented matrix: $\left[\begin{array}{rrrr}1& 1& 1& 4\\ 2& 3& -1& 8\\ 1& 1& -1& 3\end{array}\right]$

Step-by-Step Solution

Answer

System of equations that corresponds to given augmented matrix is $\left\{\begin{array}{l}x+y+z=4\\ 2x+3y-z=8\\ x+y-z=3\end{array}\right.$

Step 1. Given Information.

Given Augmented matrix is $\left[\begin{array}{rrrr}1& 1& 1& 4\\ 2& 3& -1& 8\\ 1& 1& -1& 3\end{array}\right]$

Step 2. Writing Augmented matrix into System of equations.

We remember that each row corresponds to an equation and that each entry is a coefficient of a variable or the constant. 

The vertical line replaces the equal sign. 

We know it will translate into a system of three equations with three variables.

$\left[\begin{array}{rrrr}1& 1& 1& 4\\ 2& 3& -1& 8\\ 1& 1& -1& 3\end{array}\right] \left\{\begin{array}{l}x+y+z=4\\ 2x+3y-z=8\\ x+y-z=3\end{array}\right.$