Finite Math Examples

$x = - 2$ , $y = - 4$ , $z = 0$ , $x - y + 5 z = - 6$ , $4 x + z = - 2$ , $x + 2 y + z = - 10$

Step 1

Replace all occurrences of $x$ with $- 2$ in each equation.

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Step 1.1

Replace all occurrences of $x$ in $x - y + 5 z = - 6$ with $- 2$ .

$(- 2) - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$4 x + z = - 2$

$x + 2 y + z = - 10$

Step 1.2

Simplify the left side.

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Step 1.2.1

Remove parentheses.

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$4 x + z = - 2$

$x + 2 y + z = - 10$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$4 x + z = - 2$

$x + 2 y + z = - 10$

Step 1.3

Replace all occurrences of $x$ in $4 x + z = - 2$ with $- 2$ .

$4 (- 2) + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$x + 2 y + z = - 10$

Step 1.4

Simplify the left side.

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Step 1.4.1

Multiply $4$ by $- 2$ .

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$x + 2 y + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$x + 2 y + z = - 10$

Step 1.5

Replace all occurrences of $x$ in $x + 2 y + z = - 10$ with $- 2$ .

$(- 2) + 2 y + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 1.6

Simplify the left side.

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Step 1.6.1

Remove parentheses.

$- 2 + 2 y + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$- 2 + 2 y + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$- 2 + 2 y + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 2

Replace all occurrences of $y$ with $- 4$ in each equation.

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Step 2.1

Replace all occurrences of $y$ in $- 2 + 2 y + z = - 10$ with $- 4$ .

$- 2 + 2 (- 4) + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $- 2 + 2 (- 4) + z$ .

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Step 2.2.1.1

Multiply $2$ by $- 4$ .

$- 2 - 8 + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 2.2.1.2

Subtract $8$ from $- 2$ .

$- 10 + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$- 10 + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$- 10 + z = - 10$

$- 8 + z = - 2$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 2.3

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

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Step 2.3.1

Add $8$ to both sides of the equation.

$z = - 2 + 8$

$- 10 + z = - 10$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 2.3.2

Add $- 2$ and $8$ .

$z = 6$

$- 10 + z = - 10$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

$z = 6$

$- 10 + z = - 10$

$- 2 - y + 5 z = - 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 2.4

Replace all occurrences of $y$ in $- 2 - y + 5 z = - 6$ with $- 4$ .

$- 2 - (- 4) + 5 z = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

Step 2.5

Simplify the left side.

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Step 2.5.1

Simplify $- 2 - (- 4) + 5 z$ .

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Step 2.5.1.1

Multiply $- 1$ by $- 4$ .

$- 2 + 4 + 5 z = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

Step 2.5.1.2

Add $- 2$ and $4$ .

$2 + 5 z = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

$2 + 5 z = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

$2 + 5 z = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

$2 + 5 z = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

Step 3

Replace all occurrences of $z$ with $6$ in each equation.

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Step 3.1

Replace all occurrences of $z$ in $2 + 5 z = - 6$ with $6$ .

$2 + 5 (6) = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

Step 3.2

Simplify the left side.

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Step 3.2.1

Simplify $2 + 5 (6)$ .

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Step 3.2.1.1

Multiply $5$ by $6$ .

$2 + 30 = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

Step 3.2.1.2

Add $2$ and $30$ .

$32 = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

$32 = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

$32 = - 6$

$z = 6$

$- 10 + z = - 10$

$x = - 2$

$y = - 4$

$z = 0$

Step 3.3

Replace all occurrences of $z$ in $- 10 + z = - 10$ with $6$ .

$- 10 + 6 = - 10$

$32 = - 6$

$z = 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 3.4

Simplify the left side.

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Step 3.4.1

Simplify $- 10 + 6$ .

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Step 3.4.1.1

Remove parentheses.

$- 10 + 6 = - 10$

$32 = - 6$

$z = 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 3.4.1.2

Add $- 10$ and $6$ .

$- 4 = - 10$

$32 = - 6$

$z = 6$

$x = - 2$

$y = - 4$

$z = 0$

$- 4 = - 10$

$32 = - 6$

$z = 6$

$x = - 2$

$y = - 4$

$z = 0$

$- 4 = - 10$

$32 = - 6$

$z = 6$

$x = - 2$

$y = - 4$

$z = 0$

$- 4 = - 10$

$32 = - 6$

$z = 6$

$x = - 2$

$y = - 4$

$z = 0$

Step 4

Since $- 4 = - 10$ is not true, there is no solution.

No solution