Finite Math Examples

$x + y - 2 z = 4$ , $x - y - 5 z = 0$ , $\frac{2}{5} x - \frac{7}{5} z = 4$

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.

$x - 2 z = 4 - y$

$x - y - 5 z = 0$

$\frac{2}{5} x - \frac{7}{5} z = 4$

Step 1.2

Add $2 z$ to both sides of the equation.

$x = 4 - y + 2 z$

$x - y - 5 z = 0$

$\frac{2}{5} x - \frac{7}{5} z = 4$

$x = 4 - y + 2 z$

$x - y - 5 z = 0$

$\frac{2}{5} x - \frac{7}{5} z = 4$

Step 2

Replace all occurrences of $x$ with $4 - y + 2 z$ in each equation.

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Step 2.1

Replace all occurrences of $x$ in $x - y - 5 z = 0$ with $4 - y + 2 z$ .

$(4 - y + 2 z) - y - 5 z = 0$

$x = 4 - y + 2 z$

$\frac{2}{5} x - \frac{7}{5} z = 4$

Step 2.2

Simplify the left side.

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Step 2.2.1

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

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Step 2.2.1.1

Subtract $y$ from $- y$ .

$4 - 2 y + 2 z - 5 z = 0$

$x = 4 - y + 2 z$

$\frac{2}{5} x - \frac{7}{5} z = 4$

Step 2.2.1.2

Subtract $5 z$ from $2 z$ .

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{2}{5} x - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{2}{5} x - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{2}{5} x - \frac{7}{5} z = 4$

Step 2.3

Replace all occurrences of $x$ in $\frac{2}{5} x - \frac{7}{5} z = 4$ with $4 - y + 2 z$ .

$\frac{2}{5} \cdot (4 - y + 2 z) - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4

Simplify the left side.

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Step 2.4.1

Simplify $\frac{2}{5} \cdot (4 - y + 2 z) - \frac{7}{5} z$ .

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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.

$\frac{2}{5} \cdot 4 + \frac{2}{5} \cdot (- y) + \frac{2}{5} \cdot (2 z) - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.1.2

Simplify.

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Step 2.4.1.1.2.1

Multiply $\frac{2}{5} \cdot 4$ .

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Step 2.4.1.1.2.1.1

Combine $\frac{2}{5}$ and $4$ .

$\frac{2 \cdot 4}{5} + \frac{2}{5} \cdot (- y) + \frac{2}{5} \cdot (2 z) - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.1.2.1.2

Multiply $2$ by $4$ .

$\frac{8}{5} + \frac{2}{5} \cdot (- y) + \frac{2}{5} \cdot (2 z) - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{8}{5} + \frac{2}{5} \cdot (- y) + \frac{2}{5} \cdot (2 z) - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.1.2.2

Combine $\frac{2}{5}$ and $y$ .

$\frac{8}{5} - \frac{2 y}{5} + \frac{2}{5} \cdot (2 z) - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.1.2.3

Multiply $\frac{2}{5} (2 z)$ .

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Step 2.4.1.1.2.3.1

Combine $2$ and $\frac{2}{5}$ .

$\frac{8}{5} - \frac{2 y}{5} + \frac{2 \cdot 2}{5} z - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.1.2.3.2

Multiply $2$ by $2$ .

$\frac{8}{5} - \frac{2 y}{5} + \frac{4}{5} z - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.1.2.3.3

Combine $\frac{4}{5}$ and $z$ .

$\frac{8}{5} - \frac{2 y}{5} + \frac{4 z}{5} - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{8}{5} - \frac{2 y}{5} + \frac{4 z}{5} - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{8}{5} - \frac{2 y}{5} + \frac{4 z}{5} - \frac{7}{5} z = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.1.3

Combine $z$ and $\frac{7}{5}$ .

$\frac{8}{5} - \frac{2 y}{5} + \frac{4 z}{5} - \frac{z \cdot 7}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.1.4

Move $7$ to the left of $z$ .

$\frac{8}{5} - \frac{2 y}{5} + \frac{4 z}{5} - \frac{7 z}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{8}{5} - \frac{2 y}{5} + \frac{4 z}{5} - \frac{7 z}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.2

Simplify terms.

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Step 2.4.1.2.1

Combine the numerators over the common denominator.

$\frac{8 - 2 y + 4 z - 7 z}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 2.4.1.2.2

Subtract $7 z$ from $4 z$ .

$\frac{8 - 2 y - 3 z}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{8 - 2 y - 3 z}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{8 - 2 y - 3 z}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{8 - 2 y - 3 z}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

$\frac{8 - 2 y - 3 z}{5} = 4$

$4 - 2 y - 3 z = 0$

$x = 4 - y + 2 z$

Step 3

Solve for $y$ in $4 - 2 y - 3 z = 0$ .

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Step 3.1

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

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Step 3.1.1

Subtract $4$ from both sides of the equation.

$- 2 y - 3 z = - 4$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

Step 3.1.2

Add $3 z$ to both sides of the equation.

$- 2 y = - 4 + 3 z$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

$- 2 y = - 4 + 3 z$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

Step 3.2

Divide each term in $- 2 y = - 4 + 3 z$ by $- 2$ and simplify.

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Step 3.2.1

Divide each term in $- 2 y = - 4 + 3 z$ by $- 2$ .

$\frac{- 2 y}{- 2} = \frac{- 4}{- 2} + \frac{3 z}{- 2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

Step 3.2.2

Simplify the left side.

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Step 3.2.2.1

Cancel the common factor of $- 2$ .

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Step 3.2.2.1.1

Cancel the common factor.

$\frac{- 2 y}{- 2} = \frac{- 4}{- 2} + \frac{3 z}{- 2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

Step 3.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 4}{- 2} + \frac{3 z}{- 2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

$y = \frac{- 4}{- 2} + \frac{3 z}{- 2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

$y = \frac{- 4}{- 2} + \frac{3 z}{- 2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

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

Divide $- 4$ by $- 2$ .

$y = 2 + \frac{3 z}{- 2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

Step 3.2.3.1.2

Move the negative in front of the fraction.

$y = 2 - \frac{3 z}{2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

$y = 2 - \frac{3 z}{2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

$y = 2 - \frac{3 z}{2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

$y = 2 - \frac{3 z}{2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

$y = 2 - \frac{3 z}{2}$

$\frac{8 - 2 y - 3 z}{5} = 4$

$x = 4 - y + 2 z$

Step 4

Replace all occurrences of $y$ with $2 - \frac{3 z}{2}$ in each equation.

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Step 4.1

Replace all occurrences of $y$ in $\frac{8 - 2 y - 3 z}{5} = 4$ with $2 - \frac{3 z}{2}$ .

$\frac{8 - 2 (2 - \frac{3 z}{2}) - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2

Simplify the left side.

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Step 4.2.1

Simplify the numerator.

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Step 4.2.1.1

Apply the distributive property.

$\frac{8 - 2 \cdot 2 - 2 (- \frac{3 z}{2}) - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.2

Multiply $- 2$ by $2$ .

$\frac{8 - 4 - 2 (- \frac{3 z}{2}) - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.3

Cancel the common factor of $2$ .

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Step 4.2.1.3.1

Move the leading negative in $- \frac{3 z}{2}$ into the numerator.

$\frac{8 - 4 - 2 \frac{- 3 z}{2} - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.3.2

Factor $2$ out of $- 2$ .

$\frac{8 - 4 + 2 (- 1) (\frac{- 3 z}{2}) - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.3.3

Cancel the common factor.

$\frac{8 - 4 + 2 \cdot (- 1 \frac{- 3 z}{2}) - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.3.4

Rewrite the expression.

$\frac{8 - 4 - 1 (- 3 z) - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

$\frac{8 - 4 - 1 (- 3 z) - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.4

Multiply $- 3$ by $- 1$ .

$\frac{8 - 4 + 3 z - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.5

Subtract $4$ from $8$ .

$\frac{4 + 3 z - 3 z}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.6

Subtract $3 z$ from $3 z$ .

$\frac{4 + 0}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.2.1.7

Add $4$ and $0$ .

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - y + 2 z$

Step 4.3

Replace all occurrences of $y$ in $x = 4 - y + 2 z$ with $2 - \frac{3 z}{2}$ .

$x = 4 - (2 - \frac{3 z}{2}) + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4

Simplify the right side.

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Step 4.4.1

Simplify $4 - (2 - \frac{3 z}{2}) + 2 z$ .

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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.

$x = 4 - 1 \cdot 2 + \frac{3 z}{2} + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.1.2

Multiply $- 1$ by $2$ .

$x = 4 - 2 + \frac{3 z}{2} + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.1.3

Multiply $- - \frac{3 z}{2}$ .

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Step 4.4.1.1.3.1

Multiply $- 1$ by $- 1$ .

$x = 4 - 2 + 1 (\frac{3 z}{2}) + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.1.3.2

Multiply $\frac{3 z}{2}$ by $1$ .

$x = 4 - 2 + \frac{3 z}{2} + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - 2 + \frac{3 z}{2} + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 4 - 2 + \frac{3 z}{2} + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.2

Subtract $2$ from $4$ .

$x = 2 + \frac{3 z}{2} + 2 z$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.3

To write $2 z$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$x = 2 + \frac{3 z}{2} + 2 z \cdot \frac{2}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.4

Simplify terms.

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Step 4.4.1.4.1

Combine $2 z$ and $\frac{2}{2}$ .

$x = 2 + \frac{3 z}{2} + \frac{2 z \cdot 2}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.4.2

Combine the numerators over the common denominator.

$x = 2 + \frac{3 z + 2 z \cdot 2}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 2 + \frac{3 z + 2 z \cdot 2}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.5

Simplify each term.

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Step 4.4.1.5.1

Simplify the numerator.

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Step 4.4.1.5.1.1

Factor $z$ out of $3 z + 2 z \cdot 2$ .

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Step 4.4.1.5.1.1.1

Factor $z$ out of $3 z$ .

$x = 2 + \frac{z \cdot 3 + 2 z \cdot 2}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.5.1.1.2

Factor $z$ out of $2 z \cdot 2$ .

$x = 2 + \frac{z \cdot 3 + z (2 \cdot 2)}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.5.1.1.3

Factor $z$ out of $z \cdot 3 + z (2 \cdot 2)$ .

$x = 2 + \frac{z (3 + 2 \cdot 2)}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 2 + \frac{z (3 + 2 \cdot 2)}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.5.1.2

Multiply $2$ by $2$ .

$x = 2 + \frac{z (3 + 4)}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.5.1.3

Add $3$ and $4$ .

$x = 2 + \frac{z \cdot 7}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 2 + \frac{z \cdot 7}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 4.4.1.5.2

Move $7$ to the left of $z$ .

$x = 2 + \frac{7 z}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 2 + \frac{7 z}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 2 + \frac{7 z}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 2 + \frac{7 z}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

$x = 2 + \frac{7 z}{2}$

$\frac{4}{5} = 4$

$y = 2 - \frac{3 z}{2}$

Step 5

Since $\frac{4}{5} = 4$ is not true, there is no solution.

No solution