Finite Math Examples

$0.42 x + 0.23 y + 0.15 z = x$ , $0.27 x + 0.45 y + 0.37 z = y$ , $0.31 x + 0.32 y + 0.48 z$ , $x + y + z = 1$

Step 1

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

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Step 1.1

Subtract $y$ from both sides of the equation.

$x + z = 1 - y$

$0.42 x + 0.23 y + 0.15 z = x$

$0.27 x + 0.45 y + 0.37 z = y$

Step 1.2

Subtract $z$ from both sides of the equation.

$x = 1 - y - z$

$0.42 x + 0.23 y + 0.15 z = x$

$0.27 x + 0.45 y + 0.37 z = y$

$x = 1 - y - z$

$0.42 x + 0.23 y + 0.15 z = x$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2

Replace all occurrences of $x$ with $1 - y - z$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $0.42 x + 0.23 y + 0.15 z = x$ with $1 - y - z$ .

$0.42 (1 - y - z) + 0.23 y + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2.2

Simplify the left side.

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Step 2.2.1

Simplify $0.42 (1 - y - z) + 0.23 y + 0.15 z$ .

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Step 2.2.1.1

Remove parentheses.

$0.42 (1 - y - z) + 0.23 y + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2.2.1.2

Simplify each term.

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Step 2.2.1.2.1

Apply the distributive property.

$0.42 \cdot 1 + 0.42 (- y) + 0.42 (- z) + 0.23 y + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2.2.1.2.2

Simplify.

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Step 2.2.1.2.2.1

Multiply $0.42$ by $1$ .

$0.42 + 0.42 (- y) + 0.42 (- z) + 0.23 y + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2.2.1.2.2.2

Multiply $- 1$ by $0.42$ .

$0.42 - 0.42 y + 0.42 (- z) + 0.23 y + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2.2.1.2.2.3

Multiply $- 1$ by $0.42$ .

$0.42 - 0.42 y - 0.42 z + 0.23 y + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

$0.42 - 0.42 y - 0.42 z + 0.23 y + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

$0.42 - 0.42 y - 0.42 z + 0.23 y + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2.2.1.3

Simplify by adding terms.

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Step 2.2.1.3.1

Add $- 0.42 y$ and $0.23 y$ .

$0.42 - 0.19 y - 0.42 z + 0.15 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2.2.1.3.2

Add $- 0.42 z$ and $0.15 z$ .

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 x + 0.45 y + 0.37 z = y$

Step 2.3

Replace all occurrences of $x$ in $0.27 x + 0.45 y + 0.37 z = y$ with $1 - y - z$ .

$0.27 (1 - y - z) + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 2.4

Simplify the left side.

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Step 2.4.1

Simplify $0.27 (1 - y - z) + 0.45 y + 0.37 z$ .

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Step 2.4.1.1

Simplify each term.

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Step 2.4.1.1.1

Apply the distributive property.

$0.27 \cdot 1 + 0.27 (- y) + 0.27 (- z) + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 2.4.1.1.2

Simplify.

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Step 2.4.1.1.2.1

Multiply $0.27$ by $1$ .

$0.27 + 0.27 (- y) + 0.27 (- z) + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 2.4.1.1.2.2

Multiply $- 1$ by $0.27$ .

$0.27 - 0.27 y + 0.27 (- z) + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 2.4.1.1.2.3

Multiply $- 1$ by $0.27$ .

$0.27 - 0.27 y - 0.27 z + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 - 0.27 y - 0.27 z + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 - 0.27 y - 0.27 z + 0.45 y + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 2.4.1.2

Simplify by adding terms.

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Step 2.4.1.2.1

Add $- 0.27 y$ and $0.45 y$ .

$0.27 + 0.18 y - 0.27 z + 0.37 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 2.4.1.2.2

Add $- 0.27 z$ and $0.37 z$ .

$0.27 + 0.18 y + 0.1 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 + 0.18 y + 0.1 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 + 0.18 y + 0.1 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 + 0.18 y + 0.1 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.27 + 0.18 y + 0.1 z = y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3

Solve for $z$ in $0.27 + 0.18 y + 0.1 z = y$ .

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Step 3.1

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

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Step 3.1.1

Subtract $0.27$ from both sides of the equation.

$0.18 y + 0.1 z = y - 0.27$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.1.2

Subtract $0.18 y$ from both sides of the equation.

$0.1 z = y - 0.27 - 0.18 y$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.1.3

Subtract $0.18 y$ from $y$ .

$0.1 z = 0.82 y - 0.27$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$0.1 z = 0.82 y - 0.27$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2

Divide each term in $0.1 z = 0.82 y - 0.27$ by $0.1$ and simplify.

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Step 3.2.1

Divide each term in $0.1 z = 0.82 y - 0.27$ by $0.1$ .

$\frac{0.1 z}{0.1} = \frac{0.82 y}{0.1} + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Cancel the common factor of $0.1$ .

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Step 3.2.2.1.1

Cancel the common factor.

$\frac{0.1 z}{0.1} = \frac{0.82 y}{0.1} + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2.2.1.2

Divide $z$ by $1$ .

$z = \frac{0.82 y}{0.1} + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$z = \frac{0.82 y}{0.1} + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$z = \frac{0.82 y}{0.1} + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2.3

Simplify the right side.

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Step 3.2.3.1

Simplify each term.

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Step 3.2.3.1.1

Factor $0.82$ out of $0.82 y$ .

$z = \frac{0.82 (y)}{0.1} + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2.3.1.2

Factor $0.1$ out of $0.1$ .

$z = \frac{0.82 (y)}{0.1 (1)} + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2.3.1.3

Separate fractions.

$z = \frac{0.82}{0.1} \cdot \frac{y}{1} + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2.3.1.4

Divide $0.82$ by $0.1$ .

$z = 8.2 (\frac{y}{1}) + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2.3.1.5

Divide $y$ by $1$ .

$z = 8.2 y + \frac{- 0.27}{0.1}$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 3.2.3.1.6

Divide $- 0.27$ by $0.1$ .

$z = 8.2 y - 2.7$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$z = 8.2 y - 2.7$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$z = 8.2 y - 2.7$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$z = 8.2 y - 2.7$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

$z = 8.2 y - 2.7$

$0.42 - 0.19 y - 0.27 z = 1 - y - z$

$x = 1 - y - z$

Step 4

Replace all occurrences of $z$ with $8.2 y - 2.7$ in each equation.

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Step 4.1

Replace all occurrences of $z$ in $0.42 - 0.19 y - 0.27 z = 1 - y - z$ with $8.2 y - 2.7$ .

$0.42 - 0.19 y - 0.27 (8.2 y - 2.7) = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2

Simplify $0.42 - 0.19 y - 0.27 (8.2 y - 2.7) = 1 - y - (8.2 y - 2.7)$ .

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Step 4.2.1

Simplify the left side.

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Step 4.2.1.1

Simplify $0.42 - 0.19 y - 0.27 (8.2 y - 2.7)$ .

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Step 4.2.1.1.1

Simplify each term.

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Step 4.2.1.1.1.1

Apply the distributive property.

$0.42 - 0.19 y - 0.27 (8.2 y) - 0.27 \cdot - 2.7 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.1.1.1.2

Multiply $8.2$ by $- 0.27$ .

$0.42 - 0.19 y - 2.214 y - 0.27 \cdot - 2.7 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.1.1.1.3

Multiply $- 0.27$ by $- 2.7$ .

$0.42 - 0.19 y - 2.214 y + 0.729 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$0.42 - 0.19 y - 2.214 y + 0.729 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.1.1.2

Simplify by adding terms.

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Step 4.2.1.1.2.1

Add $0.42$ and $0.729$ .

$- 0.19 y - 2.214 y + 1.149 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.1.1.2.2

Subtract $2.214 y$ from $- 0.19 y$ .

$- 2.404 y + 1.149 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$- 2.404 y + 1.149 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$- 2.404 y + 1.149 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$- 2.404 y + 1.149 = 1 - y - (8.2 y - 2.7)$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.2

Simplify the right side.

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Step 4.2.2.1

Simplify $1 - y - (8.2 y - 2.7)$ .

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Step 4.2.2.1.1

Simplify each term.

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Step 4.2.2.1.1.1

Apply the distributive property.

$- 2.404 y + 1.149 = 1 - y - (8.2 y) + 2.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.2.1.1.2

Multiply $8.2$ by $- 1$ .

$- 2.404 y + 1.149 = 1 - y - 8.2 y + 2.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.2.1.1.3

Multiply $- 1$ by $- 2.7$ .

$- 2.404 y + 1.149 = 1 - y - 8.2 y + 2.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$- 2.404 y + 1.149 = 1 - y - 8.2 y + 2.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.2.1.2

Simplify by adding terms.

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Step 4.2.2.1.2.1

Add $1$ and $2.7$ .

$- 2.404 y + 1.149 = - y - 8.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.2.2.1.2.2

Subtract $8.2 y$ from $- y$ .

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = 1 - y - z$

Step 4.3

Replace all occurrences of $z$ in $x = 1 - y - z$ with $8.2 y - 2.7$ .

$x = 1 - y - (8.2 y - 2.7)$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 4.4

Simplify the right side.

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Step 4.4.1

Simplify $1 - y - (8.2 y - 2.7)$ .

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Step 4.4.1.1

Simplify each term.

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Step 4.4.1.1.1

Apply the distributive property.

$x = 1 - y - (8.2 y) + 2.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 4.4.1.1.2

Multiply $8.2$ by $- 1$ .

$x = 1 - y - 8.2 y + 2.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 4.4.1.1.3

Multiply $- 1$ by $- 2.7$ .

$x = 1 - y - 8.2 y + 2.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = 1 - y - 8.2 y + 2.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 4.4.1.2

Simplify by adding terms.

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Step 4.4.1.2.1

Add $1$ and $2.7$ .

$x = - y - 8.2 y + 3.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 4.4.1.2.2

Subtract $8.2 y$ from $- y$ .

$x = - 9.2 y + 3.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = - 9.2 y + 3.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = - 9.2 y + 3.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = - 9.2 y + 3.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$x = - 9.2 y + 3.7$

$- 2.404 y + 1.149 = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 5

Solve for $y$ in $- 2.404 y + 1.149 = - 9.2 y + 3.7$ .

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Step 5.1

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

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Step 5.1.1

Add $9.2 y$ to both sides of the equation.

$- 2.404 y + 1.149 + 9.2 y = 3.7$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 5.1.2

Add $- 2.404 y$ and $9.2 y$ .

$6.796 y + 1.149 = 3.7$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$6.796 y + 1.149 = 3.7$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 5.2

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

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Step 5.2.1

Subtract $1.149$ from both sides of the equation.

$6.796 y = 3.7 - 1.149$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 5.2.2

Subtract $1.149$ from $3.7$ .

$6.796 y = 2.551$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$6.796 y = 2.551$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 5.3

Divide each term in $6.796 y = 2.551$ by $6.796$ and simplify.

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Step 5.3.1

Divide each term in $6.796 y = 2.551$ by $6.796$ .

$\frac{6.796 y}{6.796} = \frac{2.551}{6.796}$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 5.3.2

Simplify the left side.

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Step 5.3.2.1

Cancel the common factor of $6.796$ .

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Step 5.3.2.1.1

Cancel the common factor.

$\frac{6.796 y}{6.796} = \frac{2.551}{6.796}$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 5.3.2.1.2

Divide $y$ by $1$ .

$y = \frac{2.551}{6.796}$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$y = \frac{2.551}{6.796}$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$y = \frac{2.551}{6.796}$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 5.3.3

Simplify the right side.

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Step 5.3.3.1

Divide $2.551$ by $6.796$ .

$y = 0.37536786$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$y = 0.37536786$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$y = 0.37536786$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

$y = 0.37536786$

$x = - 9.2 y + 3.7$

$z = 8.2 y - 2.7$

Step 6

Replace all occurrences of $y$ with $0.37536786$ in each equation.

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Step 6.1

Replace all occurrences of $y$ in $x = - 9.2 y + 3.7$ with $0.37536786$ .

$x = - 9.2 \cdot 0.37536786 + 3.7$

$y = 0.37536786$

$z = 8.2 y - 2.7$

Step 6.2

Simplify the right side.

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Step 6.2.1

Simplify $- 9.2 \cdot 0.37536786 + 3.7$ .

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Step 6.2.1.1

Multiply $- 9.2$ by $0.37536786$ .

$x = - 3.45338434 + 3.7$

$y = 0.37536786$

$z = 8.2 y - 2.7$

Step 6.2.1.2

Add $- 3.45338434$ and $3.7$ .

$x = 0.24661565$

$y = 0.37536786$

$z = 8.2 y - 2.7$

$x = 0.24661565$

$y = 0.37536786$

$z = 8.2 y - 2.7$

$x = 0.24661565$

$y = 0.37536786$

$z = 8.2 y - 2.7$

Step 6.3

Replace all occurrences of $y$ in $z = 8.2 y - 2.7$ with $0.37536786$ .

$z = 8.2 (0.37536786) - 2.7$

$x = 0.24661565$

$y = 0.37536786$

Step 6.4

Simplify the right side.

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Step 6.4.1

Simplify $8.2 (0.37536786) - 2.7$ .

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Step 6.4.1.1

Multiply $8.2$ by $0.37536786$ .

$z = 3.07801648 - 2.7$

$x = 0.24661565$

$y = 0.37536786$

Step 6.4.1.2

Subtract $2.7$ from $3.07801648$ .

$z = 0.37801648$

$x = 0.24661565$

$y = 0.37536786$

$z = 0.37801648$

$x = 0.24661565$

$y = 0.37536786$

$z = 0.37801648$

$x = 0.24661565$

$y = 0.37536786$

$z = 0.37801648$

$x = 0.24661565$

$y = 0.37536786$

Step 7

The solution to the system is the complete set of ordered pairs that are valid solutions.

$(0.24661565, 0.37536786, 0.37801648)$