Linear Algebra Examples

$5 d + 15 e + f = - 9$ , $- 17 d + e - 9 f = - 103$ , $- d - 17 e + 5 f = 23$

Step 1

Find the $A X = B$ from the system of equations.

$[\begin{array}{c} 5 & 1 \\ - 17 & - 9 \\ - 1 & 5 \end{array}] \cdot [\begin{array}{c} d \\ f \end{array}] = [\begin{array}{c} - 9 - 15 e \\ - 103 - e \\ 23 + 17 e \end{array}]$

Step 2

Left multiply both sides of the matrix equation by the inverse matrix.

Step 3

Any matrix multiplied by its inverse is equal to $1$ all the time. $A \cdot A^{- 1} = 1$ .

Step 4

Simplify the left and right side.

$[\begin{array}{c} d \\ f \end{array}] =$

Step 5

Find the solution.

$d =$

$f =$