Algebra Esempi

$[\begin{array}{c} - 20 & 16 \\ 4 & 0 \\ 9 & - 6 \end{array}] - [\begin{array}{c} - 5 & 1 \\ - 6 & 7 \\ 0 & 11 \end{array}] = [\begin{array}{c} x & y \\ 10 & - 7 \\ 9 & - 17 \end{array}]$

Passaggio 1

Sottrai gli elementi corrispondenti.

$[\begin{array}{c} - 20 + 5 & 16 - 1 \\ 4 + 6 & 0 - 7 \\ 9 - 0 & - 6 - 11 \end{array}] = [\begin{array}{c} x & y \\ 10 & - 7 \\ 9 & - 17 \end{array}]$

Passaggio 2

Simplify each element.

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Passaggio 2.1

Somma $- 20$ e $5$ .

$[\begin{array}{c} - 15 & 16 - 1 \\ 4 + 6 & 0 - 7 \\ 9 - 0 & - 6 - 11 \end{array}] = [\begin{array}{c} x & y \\ 10 & - 7 \\ 9 & - 17 \end{array}]$

Passaggio 2.2

Sottrai $1$ da $16$ .

$[\begin{array}{c} - 15 & 15 \\ 4 + 6 & 0 - 7 \\ 9 - 0 & - 6 - 11 \end{array}] = [\begin{array}{c} x & y \\ 10 & - 7 \\ 9 & - 17 \end{array}]$

Passaggio 2.3

Somma $4$ e $6$ .

$[\begin{array}{c} - 15 & 15 \\ 10 & 0 - 7 \\ 9 - 0 & - 6 - 11 \end{array}] = [\begin{array}{c} x & y \\ 10 & - 7 \\ 9 & - 17 \end{array}]$

Passaggio 2.4

Sottrai $7$ da $0$ .

$[\begin{array}{c} - 15 & 15 \\ 10 & - 7 \\ 9 - 0 & - 6 - 11 \end{array}] = [\begin{array}{c} x & y \\ 10 & - 7 \\ 9 & - 17 \end{array}]$

Passaggio 2.5

Sottrai $0$ da $9$ .

$[\begin{array}{c} - 15 & 15 \\ 10 & - 7 \\ 9 & - 6 - 11 \end{array}] = [\begin{array}{c} x & y \\ 10 & - 7 \\ 9 & - 17 \end{array}]$

Passaggio 2.6

Sottrai $11$ da $- 6$ .

$[\begin{array}{c} - 15 & 15 \\ 10 & - 7 \\ 9 & - 17 \end{array}] = [\begin{array}{c} x & y \\ 10 & - 7 \\ 9 & - 17 \end{array}]$

Passaggio 3

Write as a linear system of equations.

$- 15 = x$

$15 = y$

$10 = 10$

$- 7 = - 7$

$9 = 9$

$- 17 = - 17$

Passaggio 4

Since $- 17 = - 17$ is always true, the matrix equation has infinite solutions.

Infinite solutions satisfying the system.