Lineare Algebra Beispiele

$x + 2 y = 48$ , $x + y = 30$ , $2 x + y = 50$ , $f = 70 x + 30 y$

Schritt 1

Bringe alle Terme, die Variablen enthalten, auf die linke Seite der Gleichung.

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Schritt 1.1

Subtrahiere $70 x$ von beiden Seiten der Gleichung.

$x + 2 y = 48, x + y = 30, 2 x + y = 50, f - 70 x = 30 y$

Schritt 1.2

Subtrahiere $30 y$ von beiden Seiten der Gleichung.

$x + 2 y = 48, x + y = 30, 2 x + y = 50, f - 70 x - 30 y = 0$

Schritt 2

Schreibe das Gleichungssystem in Matrixform.

$[\begin{array}{c} 0 & 1 & 2 & 48 \\ 0 & 1 & 1 & 30 \\ 0 & 2 & 1 & 50 \\ 1 & - 70 & - 30 & 0 \end{array}]$

Schritt 3

Ermittele die normierte Zeilenstufenform.

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Schritt 3.1

Swap $R_{4}$ with $R_{1}$ to put a nonzero entry at $1, 1$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 2 & 1 & 50 \\ 0 & 1 & 2 & 48 \end{array}]$

Schritt 3.2

Perform the row operation $R_{3} = R_{3} - 2 R_{2}$ to make the entry at $3, 2$ a $0$ .

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Schritt 3.2.1

Perform the row operation $R_{3} = R_{3} - 2 R_{2}$ to make the entry at $3, 2$ a $0$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 - 2 \cdot 0 & 2 - 2 \cdot 1 & 1 - 2 \cdot 1 & 50 - 2 \cdot 30 \\ 0 & 1 & 2 & 48 \end{array}]$

Schritt 3.2.2

Vereinfache $R_{3}$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & - 1 & - 10 \\ 0 & 1 & 2 & 48 \end{array}]$

Schritt 3.3

Perform the row operation $R_{4} = R_{4} - R_{2}$ to make the entry at $4, 2$ a $0$ .

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Schritt 3.3.1

Perform the row operation $R_{4} = R_{4} - R_{2}$ to make the entry at $4, 2$ a $0$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & - 1 & - 10 \\ 0 - 0 & 1 - 1 & 2 - 1 & 48 - 30 \end{array}]$

Schritt 3.3.2

Vereinfache $R_{4}$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & - 1 & - 10 \\ 0 & 0 & 1 & 18 \end{array}]$

Schritt 3.4

Multiply each element of $R_{3}$ by $- 1$ to make the entry at $3, 3$ a $1$ .

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Schritt 3.4.1

Multiply each element of $R_{3}$ by $- 1$ to make the entry at $3, 3$ a $1$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ - 0 & - 0 & - - 1 & - - 10 \\ 0 & 0 & 1 & 18 \end{array}]$

Schritt 3.4.2

Vereinfache $R_{3}$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & 1 & 10 \\ 0 & 0 & 1 & 18 \end{array}]$

Schritt 3.5

Perform the row operation $R_{4} = R_{4} - R_{3}$ to make the entry at $4, 3$ a $0$ .

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Schritt 3.5.1

Perform the row operation $R_{4} = R_{4} - R_{3}$ to make the entry at $4, 3$ a $0$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & 1 & 10 \\ 0 - 0 & 0 - 0 & 1 - 1 & 18 - 10 \end{array}]$

Schritt 3.5.2

Vereinfache $R_{4}$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & 1 & 10 \\ 0 & 0 & 0 & 8 \end{array}]$

Schritt 3.6

Multiply each element of $R_{4}$ by $\frac{1}{8}$ to make the entry at $4, 4$ a $1$ .

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Schritt 3.6.1

Multiply each element of $R_{4}$ by $\frac{1}{8}$ to make the entry at $4, 4$ a $1$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & 1 & 10 \\ \frac{0}{8} & \frac{0}{8} & \frac{0}{8} & \frac{8}{8} \end{array}]$

Schritt 3.6.2

Vereinfache $R_{4}$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & 1 & 10 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.7

Perform the row operation $R_{3} = R_{3} - 10 R_{4}$ to make the entry at $3, 4$ a $0$ .

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Schritt 3.7.1

Perform the row operation $R_{3} = R_{3} - 10 R_{4}$ to make the entry at $3, 4$ a $0$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 - 10 \cdot 0 & 0 - 10 \cdot 0 & 1 - 10 \cdot 0 & 10 - 10 \cdot 1 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.7.2

Vereinfache $R_{3}$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 30 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.8

Perform the row operation $R_{2} = R_{2} - 30 R_{4}$ to make the entry at $2, 4$ a $0$ .

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Schritt 3.8.1

Perform the row operation $R_{2} = R_{2} - 30 R_{4}$ to make the entry at $2, 4$ a $0$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 - 30 \cdot 0 & 1 - 30 \cdot 0 & 1 - 30 \cdot 0 & 30 - 30 \cdot 1 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.8.2

Vereinfache $R_{2}$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 1 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.9

Perform the row operation $R_{2} = R_{2} - R_{3}$ to make the entry at $2, 3$ a $0$ .

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Schritt 3.9.1

Perform the row operation $R_{2} = R_{2} - R_{3}$ to make the entry at $2, 3$ a $0$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 - 0 & 1 - 0 & 1 - 1 & 0 - 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.9.2

Vereinfache $R_{2}$ .

$[\begin{array}{c} 1 & - 70 & - 30 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.10

Perform the row operation $R_{1} = R_{1} + 30 R_{3}$ to make the entry at $1, 3$ a $0$ .

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Schritt 3.10.1

Perform the row operation $R_{1} = R_{1} + 30 R_{3}$ to make the entry at $1, 3$ a $0$ .

$[\begin{array}{c} 1 + 30 \cdot 0 & - 70 + 30 \cdot 0 & - 30 + 30 \cdot 1 & 0 + 30 \cdot 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.10.2

Vereinfache $R_{1}$ .

$[\begin{array}{c} 1 & - 70 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.11

Perform the row operation $R_{1} = R_{1} + 70 R_{2}$ to make the entry at $1, 2$ a $0$ .

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Schritt 3.11.1

Perform the row operation $R_{1} = R_{1} + 70 R_{2}$ to make the entry at $1, 2$ a $0$ .

$[\begin{array}{c} 1 + 70 \cdot 0 & - 70 + 70 \cdot 1 & 0 + 70 \cdot 0 & 0 + 70 \cdot 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 3.11.2

Vereinfache $R_{1}$ .

$[\begin{array}{c} 1 & 0 & 0 & 0 \\ 0 & 1 & 0 & 0 \\ 0 & 0 & 1 & 0 \\ 0 & 0 & 0 & 1 \end{array}]$

Schritt 4

Verwende die Ergebnismatrix, um die endgültigen Lösungen für das Gleichungssystem anzugeben.

$f = 0$

$x = 0$

$y = 0$

$0 = 1$

Schritt 5

Da $0 \neq 1$ , gibt es keine Lösungen.

Keine Lösung