Finite Math Examples

$[\begin{array}{c} 6 x & y - 3 & 6 \\ 3 z & 5 & 0 \end{array}] + [\begin{array}{c} - 4 x & - 4 & 7 \\ 1 & 2 & 3 m \end{array}] = [\begin{array}{c} 2 & 8 & 9 a \\ 3 & 7 & 0 \end{array}]$

Step 1

Add the corresponding elements.

$[\begin{array}{c} 6 x - 4 x & y - 3 - 4 & 6 + 7 \\ 3 z + 1 & 5 + 2 & 0 + 3 m \end{array}] = [\begin{array}{c} 2 & 8 & 9 a \\ 3 & 7 & 0 \end{array}]$

Step 2

Simplify each element.

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Step 2.1

Subtract $4 x$ from $6 x$ .

$[\begin{array}{c} 2 x & y - 3 - 4 & 6 + 7 \\ 3 z + 1 & 5 + 2 & 0 + 3 m \end{array}] = [\begin{array}{c} 2 & 8 & 9 a \\ 3 & 7 & 0 \end{array}]$

Step 2.2

Subtract $4$ from $- 3$ .

$[\begin{array}{c} 2 x & y - 7 & 6 + 7 \\ 3 z + 1 & 5 + 2 & 0 + 3 m \end{array}] = [\begin{array}{c} 2 & 8 & 9 a \\ 3 & 7 & 0 \end{array}]$

Step 2.3

Add $6$ and $7$ .

$[\begin{array}{c} 2 x & y - 7 & 13 \\ 3 z + 1 & 5 + 2 & 0 + 3 m \end{array}] = [\begin{array}{c} 2 & 8 & 9 a \\ 3 & 7 & 0 \end{array}]$

Step 2.4

Add $5$ and $2$ .

$[\begin{array}{c} 2 x & y - 7 & 13 \\ 3 z + 1 & 7 & 0 + 3 m \end{array}] = [\begin{array}{c} 2 & 8 & 9 a \\ 3 & 7 & 0 \end{array}]$

Step 2.5

Add $0$ and $3 m$ .

$[\begin{array}{c} 2 x & y - 7 & 13 \\ 3 z + 1 & 7 & 3 m \end{array}] = [\begin{array}{c} 2 & 8 & 9 a \\ 3 & 7 & 0 \end{array}]$

Step 3

Write as a linear system of equations.

$2 x = 2$

$y - 7 = 8$

$13 = 9 a$

$3 z + 1 = 3$

$7 = 7$

$3 m = 0$

Step 4

Since $7 = 7$ is always true, the matrix equation has infinite solutions.

Infinite solutions satisfying the system.