Algebra Examples

$[\begin{array}{c} 9 & 4 x + 1 \\ 7 & 4 \end{array}] = [\begin{array}{c} 2 & - 1 \\ 3 & 5 \end{array}] + [\begin{array}{c} 7 & 5 \\ 4 & - 1 \end{array}]$

Step 1

Add the corresponding elements.

$[\begin{array}{c} 9 & 4 x + 1 \\ 7 & 4 \end{array}] = [\begin{array}{c} 2 + 7 & - 1 + 5 \\ 3 + 4 & 5 - 1 \end{array}]$

Step 2

Simplify each element.

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Step 2.1

Add $2$ and $7$ .

$[\begin{array}{c} 9 & 4 x + 1 \\ 7 & 4 \end{array}] = [\begin{array}{c} 9 & - 1 + 5 \\ 3 + 4 & 5 - 1 \end{array}]$

Step 2.2

Add $- 1$ and $5$ .

$[\begin{array}{c} 9 & 4 x + 1 \\ 7 & 4 \end{array}] = [\begin{array}{c} 9 & 4 \\ 3 + 4 & 5 - 1 \end{array}]$

Step 2.3

Add $3$ and $4$ .

$[\begin{array}{c} 9 & 4 x + 1 \\ 7 & 4 \end{array}] = [\begin{array}{c} 9 & 4 \\ 7 & 5 - 1 \end{array}]$

Step 2.4

Subtract $1$ from $5$ .

$[\begin{array}{c} 9 & 4 x + 1 \\ 7 & 4 \end{array}] = [\begin{array}{c} 9 & 4 \\ 7 & 4 \end{array}]$

Step 3

Write as a linear system of equations.

$9 = 9$

$4 x + 1 = 4$

$7 = 7$

$4 = 4$

Step 4

Since $4 = 4$ is always true, the matrix equation has infinite solutions.

Infinite solutions satisfying $4 x + 1 = 4$ .