Matemática discreta Exemplos

$- 2 x \cdot 3 + 7 x \cdot 5 = 12$ , $2 x \cdot 1 + 4 x \cdot 2 + 10 x \cdot 3 + 6 x \cdot 4 + 12 x \cdot 5 = 28$ , $2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1

Move variables to the left and constant terms to the right.

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Etapa 1.1

Simplifique cada termo.

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Etapa 1.1.1

Multiplique $3$ por $- 2$ .

$- 6 x + 7 x \cdot 5 = 12$

$2 x \cdot 1 + 4 x \cdot 2 + 10 x \cdot 3 + 6 x \cdot 4 + 12 x \cdot 5 = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.1.2

Multiplique $5$ por $7$ .

$- 6 x + 35 x = 12$

$2 x \cdot 1 + 4 x \cdot 2 + 10 x \cdot 3 + 6 x \cdot 4 + 12 x \cdot 5 = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

$- 6 x + 35 x = 12$

$2 x \cdot 1 + 4 x \cdot 2 + 10 x \cdot 3 + 6 x \cdot 4 + 12 x \cdot 5 = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.2

Some $- 6 x$ e $35 x$ .

$29 x = 12$

$2 x \cdot 1 + 4 x \cdot 2 + 10 x \cdot 3 + 6 x \cdot 4 + 12 x \cdot 5 = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.3

Simplifique cada termo.

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Etapa 1.3.1

Multiplique $2$ por $1$ .

$29 x = 12$

$2 x + 4 x \cdot 2 + 10 x \cdot 3 + 6 x \cdot 4 + 12 x \cdot 5 = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.3.2

Multiplique $2$ por $4$ .

$29 x = 12$

$2 x + 8 x + 10 x \cdot 3 + 6 x \cdot 4 + 12 x \cdot 5 = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.3.3

Multiplique $3$ por $10$ .

$29 x = 12$

$2 x + 8 x + 30 x + 6 x \cdot 4 + 12 x \cdot 5 = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.3.4

Multiplique $4$ por $6$ .

$29 x = 12$

$2 x + 8 x + 30 x + 24 x + 12 x \cdot 5 = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.3.5

Multiplique $5$ por $12$ .

$29 x = 12$

$2 x + 8 x + 30 x + 24 x + 60 x = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

$29 x = 12$

$2 x + 8 x + 30 x + 24 x + 60 x = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.4

Some $2 x$ e $8 x$ .

$29 x = 12$

$10 x + 30 x + 24 x + 60 x = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.5

Some $10 x$ e $30 x$ .

$29 x = 12$

$40 x + 24 x + 60 x = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.6

Some $40 x$ e $24 x$ .

$29 x = 12$

$64 x + 60 x = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.7

Some $64 x$ e $60 x$ .

$29 x = 12$

$124 x = 28$

$2 x \cdot 1 + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.8

Simplifique cada termo.

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Etapa 1.8.1

Multiplique $2$ por $1$ .

$29 x = 12$

$124 x = 28$

$2 x + 4 x \cdot 2 - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.8.2

Multiplique $2$ por $4$ .

$29 x = 12$

$124 x = 28$

$2 x + 8 x - 5 x \cdot 3 + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.8.3

Multiplique $3$ por $- 5$ .

$29 x = 12$

$124 x = 28$

$2 x + 8 x - 15 x + 6 x \cdot 4 - 5 x \cdot 5 = - 1$

Etapa 1.8.4

Multiplique $4$ por $6$ .

$29 x = 12$

$124 x = 28$

$2 x + 8 x - 15 x + 24 x - 5 x \cdot 5 = - 1$

Etapa 1.8.5

Multiplique $5$ por $- 5$ .

$29 x = 12$

$124 x = 28$

$2 x + 8 x - 15 x + 24 x - 25 x = - 1$

$29 x = 12$

$124 x = 28$

$2 x + 8 x - 15 x + 24 x - 25 x = - 1$

Etapa 1.9

Some $2 x$ e $8 x$ .

$29 x = 12$

$124 x = 28$

$10 x - 15 x + 24 x - 25 x = - 1$

Etapa 1.10

Subtraia $15 x$ de $10 x$ .

$29 x = 12$

$124 x = 28$

$- 5 x + 24 x - 25 x = - 1$

Etapa 1.11

Some $- 5 x$ e $24 x$ .

$29 x = 12$

$124 x = 28$

$19 x - 25 x = - 1$

Etapa 1.12

Subtraia $25 x$ de $19 x$ .

$29 x = 12$

$124 x = 28$

$- 6 x = - 1$

$29 x = 12$

$124 x = 28$

$- 6 x = - 1$

Etapa 2

Write the system as a matrix.

$[\begin{array}{c} 29 & 12 \\ 124 & 28 \\ - 6 & - 1 \end{array}]$

Etapa 3

Encontre a forma escalonada reduzida por linhas.

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Etapa 3.1

Multiply each element of $R_{1}$ by $\frac{1}{29}$ to make the entry at $1, 1$ a $1$ .

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Etapa 3.1.1

Multiply each element of $R_{1}$ by $\frac{1}{29}$ to make the entry at $1, 1$ a $1$ .

$[\begin{array}{c} \frac{29}{29} & \frac{12}{29} \\ 124 & 28 \\ - 6 & - 1 \end{array}]$

Etapa 3.1.2

Simplifique $R_{1}$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ 124 & 28 \\ - 6 & - 1 \end{array}]$

Etapa 3.2

Perform the row operation $R_{2} = R_{2} - 124 R_{1}$ to make the entry at $2, 1$ a $0$ .

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Etapa 3.2.1

Perform the row operation $R_{2} = R_{2} - 124 R_{1}$ to make the entry at $2, 1$ a $0$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ 124 - 124 \cdot 1 & 28 - 124 (\frac{12}{29}) \\ - 6 & - 1 \end{array}]$

Etapa 3.2.2

Simplifique $R_{2}$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ 0 & - \frac{676}{29} \\ - 6 & - 1 \end{array}]$

Etapa 3.3

Perform the row operation $R_{3} = R_{3} + 6 R_{1}$ to make the entry at $3, 1$ a $0$ .

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Etapa 3.3.1

Perform the row operation $R_{3} = R_{3} + 6 R_{1}$ to make the entry at $3, 1$ a $0$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ 0 & - \frac{676}{29} \\ - 6 + 6 \cdot 1 & - 1 + 6 (\frac{12}{29}) \end{array}]$

Etapa 3.3.2

Simplifique $R_{3}$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ 0 & - \frac{676}{29} \\ 0 & \frac{43}{29} \end{array}]$

Etapa 3.4

Multiply each element of $R_{2}$ by $- \frac{29}{676}$ to make the entry at $2, 2$ a $1$ .

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Etapa 3.4.1

Multiply each element of $R_{2}$ by $- \frac{29}{676}$ to make the entry at $2, 2$ a $1$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ - \frac{29}{676} \cdot 0 & - \frac{29}{676} (- \frac{676}{29}) \\ 0 & \frac{43}{29} \end{array}]$

Etapa 3.4.2

Simplifique $R_{2}$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ 0 & 1 \\ 0 & \frac{43}{29} \end{array}]$

Etapa 3.5

Perform the row operation $R_{3} = R_{3} - \frac{43}{29} R_{2}$ to make the entry at $3, 2$ a $0$ .

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Etapa 3.5.1

Perform the row operation $R_{3} = R_{3} - \frac{43}{29} R_{2}$ to make the entry at $3, 2$ a $0$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ 0 & 1 \\ 0 - \frac{43}{29} \cdot 0 & \frac{43}{29} - \frac{43}{29} \cdot 1 \end{array}]$

Etapa 3.5.2

Simplifique $R_{3}$ .

$[\begin{array}{c} 1 & \frac{12}{29} \\ 0 & 1 \\ 0 & 0 \end{array}]$

Etapa 3.6

Perform the row operation $R_{1} = R_{1} - \frac{12}{29} R_{2}$ to make the entry at $1, 2$ a $0$ .

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Etapa 3.6.1

Perform the row operation $R_{1} = R_{1} - \frac{12}{29} R_{2}$ to make the entry at $1, 2$ a $0$ .

$[\begin{array}{c} 1 - \frac{12}{29} \cdot 0 & \frac{12}{29} - \frac{12}{29} \cdot 1 \\ 0 & 1 \\ 0 & 0 \end{array}]$

Etapa 3.6.2

Simplifique $R_{1}$ .

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

Etapa 4

Use the result matrix to declare the final solution to the system of equations.

$x = 0$

$0 = 1$

$0 = 0$

Etapa 5

The solution is the set of ordered pairs that make the system true.

$(error = error)$