Finite Math Examples

$[\begin{array}{c} 0.75 s \cdot 1 & 0.25 s \cdot 2 & 0.1 s \cdot 3 & s \cdot 1 \\ 0.15 s \cdot 1 & 0.65 s \cdot 2 & 0.2 s \cdot 3 & s \cdot 2 \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 1

Multiply $0.75$ by $1$ .

$[\begin{array}{c} 0.75 s & 0.25 s \cdot 2 & 0.1 s \cdot 3 & s \cdot 1 \\ 0.15 s \cdot 1 & 0.65 s \cdot 2 & 0.2 s \cdot 3 & s \cdot 2 \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 2

Multiply $2$ by $0.25$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.1 s \cdot 3 & s \cdot 1 \\ 0.15 s \cdot 1 & 0.65 s \cdot 2 & 0.2 s \cdot 3 & s \cdot 2 \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 3

Multiply $3$ by $0.1$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \cdot 1 \\ 0.15 s \cdot 1 & 0.65 s \cdot 2 & 0.2 s \cdot 3 & s \cdot 2 \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 4

Multiply $s$ by $1$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s \cdot 1 & 0.65 s \cdot 2 & 0.2 s \cdot 3 & s \cdot 2 \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 5

Multiply $0.15$ by $1$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s & 0.65 s \cdot 2 & 0.2 s \cdot 3 & s \cdot 2 \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 6

Multiply $2$ by $0.65$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s & 1.3 s & 0.2 s \cdot 3 & s \cdot 2 \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 7

Multiply $3$ by $0.2$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s & 1.3 s & 0.6 s & s \cdot 2 \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 8

Move $2$ to the left of $s$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s & 1.3 s & 0.6 s & 2 s \\ 0.1 s \cdot 1 & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 9

Multiply $0.1$ by $1$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s & 1.3 s & 0.6 s & 2 s \\ 0.1 s & 0.1 s \cdot 2 & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 10

Multiply $2$ by $0.1$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s & 1.3 s & 0.6 s & 2 s \\ 0.1 s & 0.2 s & 0.7 s \cdot 3 & s \cdot 3 \end{array}]$

Step 11

Multiply $3$ by $0.7$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s & 1.3 s & 0.6 s & 2 s \\ 0.1 s & 0.2 s & 2.1 s & s \cdot 3 \end{array}]$

Step 12

Move $3$ to the left of $s$ .

$[\begin{array}{c} 0.75 s & 0.5 s & 0.3 s & s \\ 0.15 s & 1.3 s & 0.6 s & 2 s \\ 0.1 s & 0.2 s & 2.1 s & 3 s \end{array}]$

Step 13

Multiply each element of $R_{1}$ by $\frac{1}{0.75 s}$ to make the entry at $1, 1$ a $1$ .

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Step 13.1

Multiply each element of $R_{1}$ by $\frac{1}{0.75 s}$ to make the entry at $1, 1$ a $1$ .

$[\begin{array}{c} \frac{0.75 s}{0.75 s} & \frac{0.5 s}{0.75 s} & \frac{0.3 s}{0.75 s} & \frac{s}{0.75 s} \\ 0.15 s & 1.3 s & 0.6 s & 2 s \\ 0.1 s & 0.2 s & 2.1 s & 3 s \end{array}]$

Step 13.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0.15 s & 1.3 s & 0.6 s & 2 s \\ 0.1 s & 0.2 s & 2.1 s & 3 s \end{array}]$

Step 14

Perform the row operation $R_{2} = R_{2} - 0.15 s R_{1}$ to make the entry at $2, 1$ a $0$ .

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Step 14.1

Perform the row operation $R_{2} = R_{2} - 0.15 s R_{1}$ to make the entry at $2, 1$ a $0$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0.15 s - 0.15 s \cdot 1 & 1.3 s - 0.15 s \cdot 0.\overline{6} & 0.6 s - 0.15 s \cdot 0.4 & 2 s - 0.15 s \cdot 1.\overline{3} \\ 0.1 s & 0.2 s & 2.1 s & 3 s \end{array}]$

Step 14.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1.2 s & 0.54 s & 1.8 s \\ 0.1 s & 0.2 s & 2.1 s & 3 s \end{array}]$

Step 15

Perform the row operation $R_{3} = R_{3} - 0.1 s R_{1}$ to make the entry at $3, 1$ a $0$ .

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Step 15.1

Perform the row operation $R_{3} = R_{3} - 0.1 s R_{1}$ to make the entry at $3, 1$ a $0$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1.2 s & 0.54 s & 1.8 s \\ 0.1 s - 0.1 s \cdot 1 & 0.2 s - 0.1 s \cdot 0.\overline{6} & 2.1 s - 0.1 s \cdot 0.4 & 3 s - 0.1 s \cdot 1.\overline{3} \end{array}]$

Step 15.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1.2 s & 0.54 s & 1.8 s \\ 0 & 0.1\overline{3} s & 2.06 s & 2.8\overline{6} s \end{array}]$

Step 16

Multiply each element of $R_{2}$ by $\frac{1}{1.2 s}$ to make the entry at $2, 2$ a $1$ .

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Step 16.1

Multiply each element of $R_{2}$ by $\frac{1}{1.2 s}$ to make the entry at $2, 2$ a $1$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ \frac{0}{1.2 s} & \frac{1.2 s}{1.2 s} & \frac{0.54 s}{1.2 s} & \frac{1.8 s}{1.2 s} \\ 0 & 0.1\overline{3} s & 2.06 s & 2.8\overline{6} s \end{array}]$

Step 16.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1 & 0.45 & 1.5 \\ 0 & 0.1\overline{3} s & 2.06 s & 2.8\overline{6} s \end{array}]$

Step 17

Perform the row operation $R_{3} = R_{3} - 0.1\overline{3} s R_{2}$ to make the entry at $3, 2$ a $0$ .

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Step 17.1

Perform the row operation $R_{3} = R_{3} - 0.1\overline{3} s R_{2}$ to make the entry at $3, 2$ a $0$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1 & 0.45 & 1.5 \\ 0 - 0.1\overline{3} s \cdot 0 & 0.1\overline{3} s - 0.1\overline{3} s \cdot 1 & 2.06 s - 0.1\overline{3} s \cdot 0.45 & 2.8\overline{6} s - 0.1\overline{3} s \cdot 1.5 \end{array}]$

Step 17.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1 & 0.45 & 1.5 \\ 0 & 0 & 2 s & 2.\overline{6} s \end{array}]$

Step 18

Multiply each element of $R_{3}$ by $\frac{1}{2 s}$ to make the entry at $3, 3$ a $1$ .

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Step 18.1

Multiply each element of $R_{3}$ by $\frac{1}{2 s}$ to make the entry at $3, 3$ a $1$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1 & 0.45 & 1.5 \\ \frac{0}{2 s} & \frac{0}{2 s} & \frac{2 s}{2 s} & \frac{2.\overline{6} s}{2 s} \end{array}]$

Step 18.2

Simplify $R_{3}$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1 & 0.45 & 1.5 \\ 0 & 0 & 1 & 1.\overline{3} \end{array}]$

Step 19

Perform the row operation $R_{2} = R_{2} - 0.45 R_{3}$ to make the entry at $2, 3$ a $0$ .

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Step 19.1

Perform the row operation $R_{2} = R_{2} - 0.45 R_{3}$ to make the entry at $2, 3$ a $0$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 - 0.45 \cdot 0 & 1 - 0.45 \cdot 0 & 0.45 - 0.45 \cdot 1 & 1.5 - 0.45 \cdot 1.\overline{3} \\ 0 & 0 & 1 & 1.\overline{3} \end{array}]$

Step 19.2

Simplify $R_{2}$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0.4 & 1.\overline{3} \\ 0 & 1 & 0 & 0.9 \\ 0 & 0 & 1 & 1.\overline{3} \end{array}]$

Step 20

Perform the row operation $R_{1} = R_{1} - 0.4 R_{3}$ to make the entry at $1, 3$ a $0$ .

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Step 20.1

Perform the row operation $R_{1} = R_{1} - 0.4 R_{3}$ to make the entry at $1, 3$ a $0$ .

$[\begin{array}{c} 1 - 0.4 \cdot 0 & 0.\overline{6} - 0.4 \cdot 0 & 0.4 - 0.4 \cdot 1 & 1.\overline{3} - 0.4 \cdot 1.\overline{3} \\ 0 & 1 & 0 & 0.9 \\ 0 & 0 & 1 & 1.\overline{3} \end{array}]$

Step 20.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & 0.\overline{6} & 0 & 0.7\overline{9} \\ 0 & 1 & 0 & 0.9 \\ 0 & 0 & 1 & 1.\overline{3} \end{array}]$

Step 21

Perform the row operation $R_{1} = R_{1} - 0.\overline{6} R_{2}$ to make the entry at $1, 2$ a $0$ .

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Step 21.1

Perform the row operation $R_{1} = R_{1} - 0.\overline{6} R_{2}$ to make the entry at $1, 2$ a $0$ .

$[\begin{array}{c} 1 - 0.\overline{6} \cdot 0 & 0.\overline{6} - 0.\overline{6} \cdot 1 & 0 - 0.\overline{6} \cdot 0 & 0.7\overline{9} - 0.\overline{6} \cdot 0.9 \\ 0 & 1 & 0 & 0.9 \\ 0 & 0 & 1 & 1.\overline{3} \end{array}]$

Step 21.2

Simplify $R_{1}$ .

$[\begin{array}{c} 1 & 0 & 0 & 0.1\overline{9} \\ 0 & 1 & 0 & 0.9 \\ 0 & 0 & 1 & 1.\overline{3} \end{array}]$