Algebra Examples

$2 [\begin{array}{c} - 5 & - 2 \\ 0 & 7 \end{array}] = [\begin{array}{c} - 10 & x \\ 0 & 14 \end{array}]$

Step 1

Multiply $2$ by each element of the matrix.

$[\begin{array}{c} 2 \cdot - 5 & 2 \cdot - 2 \\ 2 \cdot 0 & 2 \cdot 7 \end{array}] = [\begin{array}{c} - 10 & x \\ 0 & 14 \end{array}]$

Step 2

Simplify each element in the matrix.

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Step 2.1

Multiply $2$ by $- 5$ .

$[\begin{array}{c} - 10 & 2 \cdot - 2 \\ 2 \cdot 0 & 2 \cdot 7 \end{array}] = [\begin{array}{c} - 10 & x \\ 0 & 14 \end{array}]$

Step 2.2

Multiply $2$ by $- 2$ .

$[\begin{array}{c} - 10 & - 4 \\ 2 \cdot 0 & 2 \cdot 7 \end{array}] = [\begin{array}{c} - 10 & x \\ 0 & 14 \end{array}]$

Step 2.3

Multiply $2$ by $0$ .

$[\begin{array}{c} - 10 & - 4 \\ 0 & 2 \cdot 7 \end{array}] = [\begin{array}{c} - 10 & x \\ 0 & 14 \end{array}]$

Step 2.4

Multiply $2$ by $7$ .

$[\begin{array}{c} - 10 & - 4 \\ 0 & 14 \end{array}] = [\begin{array}{c} - 10 & x \\ 0 & 14 \end{array}]$

Step 3

Write as a linear system of equations.

$- 10 = - 10$

$- 4 = x$

$0 = 0$

$14 = 14$

Step 4

Since $14 = 14$ is always true, the matrix equation has infinite solutions.

Infinite solutions satisfying $- 4 = x$ .