Linear Algebra Examples

$[\begin{array}{c} x & 3 & 2 x - 1 \\ y & 4 & 3 y \end{array}] = [\begin{array}{c} 2 x - 4 & z & 7 \\ 8 & w + 1 & 2 y + 8 \end{array}]$

Step 1

Write as a linear system of equations.

$x = 2 x - 4$

$3 = z$

$2 x - 1 = 7$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2

Solve the system of equations.

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Step 2.1

Replace all occurrences of $y$ with $8$ in each equation.

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Step 2.1.1

Move all terms containing $x$ to the left side of the equation.

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Step 2.1.1.1

Subtract $2 x$ from both sides of the equation.

$x - 2 x = - 4$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.1.2

Subtract $2 x$ from $x$ .

$- x = - 4$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

$- x = - 4$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.2

Divide each term in $- x = - 4$ by $- 1$ and simplify.

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Step 2.1.2.1

Divide each term in $- x = - 4$ by $- 1$ .

$\frac{- x}{- 1} = \frac{- 4}{- 1}$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.2.2

Simplify the left side.

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Step 2.1.2.2.1

Dividing two negative values results in a positive value.

$\frac{x}{1} = \frac{- 4}{- 1}$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.2.2.2

Divide $x$ by $1$ .

$x = \frac{- 4}{- 1}$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

$x = \frac{- 4}{- 1}$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.2.3

Simplify the right side.

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Step 2.1.2.3.1

Divide $- 4$ by $- 1$ .

$x = 4$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

$x = 4$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

$x = 4$

$y = 8$

$3 = z$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.3

Rewrite the equation as $z = 3$ .

$z = 3$

$x = 4$

$y = 8$

$2 x - 1 = 7$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.4

Move all terms not containing $x$ to the right side of the equation.

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Step 2.1.4.1

Add $1$ to both sides of the equation.

$2 x = 7 + 1$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.4.2

Add $7$ and $1$ .

$2 x = 8$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

$2 x = 8$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.5

Divide each term in $2 x = 8$ by $2$ and simplify.

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Step 2.1.5.1

Divide each term in $2 x = 8$ by $2$ .

$\frac{2 x}{2} = \frac{8}{2}$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.5.2

Simplify the left side.

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Step 2.1.5.2.1

Cancel the common factor of $2$ .

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Step 2.1.5.2.1.1

Cancel the common factor.

$\frac{2 x}{2} = \frac{8}{2}$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.5.2.1.2

Divide $x$ by $1$ .

$x = \frac{8}{2}$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

$x = \frac{8}{2}$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

$x = \frac{8}{2}$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.5.3

Simplify the right side.

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Step 2.1.5.3.1

Divide $8$ by $2$ .

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$4 = w + 1$

$3 y = 2 y + 8$

Step 2.1.6

Rewrite the equation as $w + 1 = 4$ .

$w + 1 = 4$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$3 y = 2 y + 8$

Step 2.1.7

Move all terms not containing $w$ to the right side of the equation.

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Step 2.1.7.1

Subtract $1$ from both sides of the equation.

$w = 4 - 1$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$3 y = 2 y + 8$

Step 2.1.7.2

Subtract $1$ from $4$ .

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$3 y = 2 y + 8$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$3 y = 2 y + 8$

Step 2.1.8

Replace all occurrences of $y$ in $3 y = 2 y + 8$ with $8$ .

$3 (8) = 2 (8) + 8$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

Step 2.1.9

Simplify $3 (8) = 2 (8) + 8$ .

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Step 2.1.9.1

Simplify the left side.

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Step 2.1.9.1.1

Multiply $3$ by $8$ .

$24 = 2 (8) + 8$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$24 = 2 (8) + 8$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

Step 2.1.9.2

Simplify the right side.

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Step 2.1.9.2.1

Simplify $2 (8) + 8$ .

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Step 2.1.9.2.1.1

Multiply $2$ by $8$ .

$24 = 16 + 8$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

Step 2.1.9.2.1.2

Add $16$ and $8$ .

$24 = 24$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$24 = 24$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$24 = 24$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$24 = 24$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

$24 = 24$

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

Step 2.2

Remove any equations from the system that are always true.

$w = 3$

$x = 4$

$z = 3$

$x = 4$

$y = 8$

Step 2.3

List all of the solutions.

$w = 3, x = 4, z = 3, y = 8$