Finite Math Examples

$3 x + y - z = 0$ , $2 x - y + 3 z = - 7$

Step 1

Solve the equation for $x$ .

Tap for more steps...

Step 1.1

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

Tap for more steps...

Step 1.1.1

Subtract $y$ from both sides of the equation.

$3 x - z = - y$

$2 x - y + 3 z = - 7$

Step 1.1.2

Add $z$ to both sides of the equation.

$3 x = - y + z$

$2 x - y + 3 z = - 7$

$3 x = - y + z$

$2 x - y + 3 z = - 7$

Step 1.2

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

Tap for more steps...

Step 1.2.1

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

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

$2 x - y + 3 z = - 7$

Step 1.2.2

Simplify the left side.

Tap for more steps...

Step 1.2.2.1

Cancel the common factor of $3$ .

Tap for more steps...

Step 1.2.2.1.1

Cancel the common factor.

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

$2 x - y + 3 z = - 7$

Step 1.2.2.1.2

Divide $x$ by $1$ .

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

$2 x - y + 3 z = - 7$

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

$2 x - y + 3 z = - 7$

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

$2 x - y + 3 z = - 7$

Step 1.2.3

Simplify the right side.

Tap for more steps...

Step 1.2.3.1

Move the negative in front of the fraction.

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

$2 x - y + 3 z = - 7$

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

$2 x - y + 3 z = - 7$

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

$2 x - y + 3 z = - 7$

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

$2 x - y + 3 z = - 7$

Step 2

Solve the equation for $y$ .

Tap for more steps...

Step 2.1

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

Tap for more steps...

Step 2.1.1

Simplify each term.

Tap for more steps...

Step 2.1.1.1

Apply the distributive property.

$2 (- \frac{y}{3}) + 2 (\frac{z}{3}) - y + 3 z = - 7$

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

Step 2.1.1.2

Multiply $2 (- \frac{y}{3})$ .

Tap for more steps...

Step 2.1.1.2.1

Multiply $- 1$ by $2$ .

$- 2 \frac{y}{3} + 2 (\frac{z}{3}) - y + 3 z = - 7$

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

Step 2.1.1.2.2

Combine $- 2$ and $\frac{y}{3}$ .

$\frac{- 2 y}{3} + 2 (\frac{z}{3}) - y + 3 z = - 7$

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

$\frac{- 2 y}{3} + 2 (\frac{z}{3}) - y + 3 z = - 7$

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

Step 2.1.1.3

Combine $2$ and $\frac{z}{3}$ .

$\frac{- 2 y}{3} + \frac{2 z}{3} - y + 3 z = - 7$

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

Step 2.1.1.4

Move the negative in front of the fraction.

$- \frac{2 y}{3} + \frac{2 z}{3} - y + 3 z = - 7$

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

$- \frac{2 y}{3} + \frac{2 z}{3} - y + 3 z = - 7$

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

Step 2.1.2

To write $- y$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$\frac{2 z}{3} - \frac{2 y}{3} - y \cdot \frac{3}{3} + 3 z = - 7$

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

Step 2.1.3

Combine $- y$ and $\frac{3}{3}$ .

$\frac{2 z}{3} - \frac{2 y}{3} + \frac{- y \cdot 3}{3} + 3 z = - 7$

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

Step 2.1.4

Combine the numerators over the common denominator.

$\frac{2 z}{3} + \frac{- 2 y - y \cdot 3}{3} + 3 z = - 7$

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

Step 2.1.5

Combine the numerators over the common denominator.

$3 z + \frac{2 z - 2 y - y \cdot 3}{3} = - 7$

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

Step 2.1.6

Multiply $3$ by $- 1$ .

$3 z + \frac{2 z - 2 y - 3 y}{3} = - 7$

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

Step 2.1.7

Subtract $3 y$ from $- 2 y$ .

$3 z + \frac{2 z - 5 y}{3} = - 7$

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

Step 2.1.8

To write $3 z$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$3 z \cdot \frac{3}{3} + \frac{2 z - 5 y}{3} = - 7$

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

Step 2.1.9

Simplify terms.

Tap for more steps...

Step 2.1.9.1

Combine $3 z$ and $\frac{3}{3}$ .

$\frac{3 z \cdot 3}{3} + \frac{2 z - 5 y}{3} = - 7$

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

Step 2.1.9.2

Combine the numerators over the common denominator.

$\frac{3 z \cdot 3 + 2 z - 5 y}{3} = - 7$

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

$\frac{3 z \cdot 3 + 2 z - 5 y}{3} = - 7$

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

Step 2.1.10

Simplify the numerator.

Tap for more steps...

Step 2.1.10.1

Multiply $3$ by $3$ .

$\frac{9 z + 2 z - 5 y}{3} = - 7$

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

Step 2.1.10.2

Add $9 z$ and $2 z$ .

$\frac{11 z - 5 y}{3} = - 7$

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

$\frac{11 z - 5 y}{3} = - 7$

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

$\frac{11 z - 5 y}{3} = - 7$

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

Step 2.2

Multiply both sides by $3$ .

$\frac{11 z - 5 y}{3} \cdot 3 = - 7 \cdot 3$

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

Step 2.3

Simplify.

Tap for more steps...

Step 2.3.1

Simplify the left side.

Tap for more steps...

Step 2.3.1.1

Simplify $\frac{11 z - 5 y}{3} \cdot 3$ .

Tap for more steps...

Step 2.3.1.1.1

Cancel the common factor of $3$ .

Tap for more steps...

Step 2.3.1.1.1.1

Cancel the common factor.

$\frac{11 z - 5 y}{3} \cdot 3 = - 7 \cdot 3$

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

Step 2.3.1.1.1.2

Rewrite the expression.

$11 z - 5 y = - 7 \cdot 3$

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

$11 z - 5 y = - 7 \cdot 3$

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

Step 2.3.1.1.2

Reorder $11 z$ and $- 5 y$ .

$- 5 y + 11 z = - 7 \cdot 3$

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

$- 5 y + 11 z = - 7 \cdot 3$

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

$- 5 y + 11 z = - 7 \cdot 3$

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

Step 2.3.2

Simplify the right side.

Tap for more steps...

Step 2.3.2.1

Multiply $- 7$ by $3$ .

$- 5 y + 11 z = - 21$

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

$- 5 y + 11 z = - 21$

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

$- 5 y + 11 z = - 21$

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

Step 2.4

Solve for $y$ .

Tap for more steps...

Step 2.4.1

Subtract $11 z$ from both sides of the equation.

$- 5 y = - 21 - 11 z$

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

Step 2.4.2

Divide each term in $- 5 y = - 21 - 11 z$ by $- 5$ and simplify.

Tap for more steps...

Step 2.4.2.1

Divide each term in $- 5 y = - 21 - 11 z$ by $- 5$ .

$\frac{- 5 y}{- 5} = \frac{- 21}{- 5} + \frac{- 11 z}{- 5}$

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

Step 2.4.2.2

Simplify the left side.

Tap for more steps...

Step 2.4.2.2.1

Cancel the common factor of $- 5$ .

Tap for more steps...

Step 2.4.2.2.1.1

Cancel the common factor.

$\frac{- 5 y}{- 5} = \frac{- 21}{- 5} + \frac{- 11 z}{- 5}$

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

Step 2.4.2.2.1.2

Divide $y$ by $1$ .

$y = \frac{- 21}{- 5} + \frac{- 11 z}{- 5}$

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

$y = \frac{- 21}{- 5} + \frac{- 11 z}{- 5}$

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

$y = \frac{- 21}{- 5} + \frac{- 11 z}{- 5}$

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

Step 2.4.2.3

Simplify the right side.

Tap for more steps...

Step 2.4.2.3.1

Simplify each term.

Tap for more steps...

Step 2.4.2.3.1.1

Dividing two negative values results in a positive value.

$y = \frac{21}{5} + \frac{- 11 z}{- 5}$

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

Step 2.4.2.3.1.2

Dividing two negative values results in a positive value.

$y = \frac{21}{5} + \frac{11 z}{5}$

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

$y = \frac{21}{5} + \frac{11 z}{5}$

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

$y = \frac{21}{5} + \frac{11 z}{5}$

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

$y = \frac{21}{5} + \frac{11 z}{5}$

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

$y = \frac{21}{5} + \frac{11 z}{5}$

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

$y = \frac{21}{5} + \frac{11 z}{5}$

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

Step 3

Simplify the right side.

Tap for more steps...

Step 3.1

Simplify $- \frac{\frac{21}{5} + \frac{11 z}{5}}{3} + \frac{z}{3}$ .

Tap for more steps...

Step 3.1.1

Combine the numerators over the common denominator.

$x = \frac{- (\frac{21}{5} + \frac{11 z}{5}) + z}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.2

Apply the distributive property.

$x = \frac{- \frac{21}{5} - \frac{11 z}{5} + z}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.3

To write $z$ as a fraction with a common denominator, multiply by $\frac{5}{5}$ .

$x = \frac{- \frac{21}{5} - \frac{11 z}{5} + z \cdot \frac{5}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.4

Simplify terms.

Tap for more steps...

Step 3.1.4.1

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

$x = \frac{- \frac{21}{5} - \frac{11 z}{5} + \frac{z \cdot 5}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.4.2

Combine the numerators over the common denominator.

$x = \frac{- \frac{21}{5} + \frac{- 11 z + z \cdot 5}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.4.3

Combine the numerators over the common denominator.

$x = \frac{\frac{- 21 - 11 z + z \cdot 5}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

$x = \frac{\frac{- 21 - 11 z + z \cdot 5}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.5

Move $5$ to the left of $z$ .

$x = \frac{\frac{- 21 - 11 z + 5 z}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.6

Simplify terms.

Tap for more steps...

Step 3.1.6.1

Add $- 11 z$ and $5 z$ .

$x = \frac{\frac{- 21 - 6 z}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.6.2

Factor $3$ out of $- 21 - 6 z$ .

Tap for more steps...

Step 3.1.6.2.1

Factor $3$ out of $- 21$ .

$x = \frac{\frac{3 (- 7) - 6 z}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.6.2.2

Factor $3$ out of $- 6 z$ .

$x = \frac{\frac{3 (- 7) + 3 (- 2 z)}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.6.2.3

Factor $3$ out of $3 (- 7) + 3 (- 2 z)$ .

$x = \frac{\frac{3 (- 7 - 2 z)}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

$x = \frac{\frac{3 (- 7 - 2 z)}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.6.3

Rewrite $- 7$ as $- 1 (7)$ .

$x = \frac{\frac{3 (- 1 \cdot 7 - 2 z)}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.6.4

Factor $- 1$ out of $- 2 z$ .

$x = \frac{\frac{3 (- 1 \cdot 7 - (2 z))}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.6.5

Factor $- 1$ out of $- 1 (7) - (2 z)$ .

$x = \frac{\frac{3 (- 1 (7 + 2 z))}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.6.6

Move the negative in front of the fraction.

$x = \frac{- \frac{3 (7 + 2 z)}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

$x = \frac{- \frac{3 (7 + 2 z)}{5}}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.7

Multiply the numerator by the reciprocal of the denominator.

$x = - \frac{3 (7 + 2 z)}{5} \cdot \frac{1}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.8

Cancel the common factor of $3$ .

Tap for more steps...

Step 3.1.8.1

Move the leading negative in $- \frac{3 (7 + 2 z)}{5}$ into the numerator.

$x = \frac{- 3 (7 + 2 z)}{5} \cdot \frac{1}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.8.2

Factor $3$ out of $- 3 (7 + 2 z)$ .

$x = \frac{3 (- (7 + 2 z))}{5} \cdot \frac{1}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.8.3

Cancel the common factor.

$x = \frac{3 (- (7 + 2 z))}{5} \cdot \frac{1}{3}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.8.4

Rewrite the expression.

$x = \frac{- (7 + 2 z)}{5}$

$y = \frac{21}{5} + \frac{11 z}{5}$

$x = \frac{- (7 + 2 z)}{5}$

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 3.1.9

Move the negative in front of the fraction.

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

$y = \frac{21}{5} + \frac{11 z}{5}$

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

$y = \frac{21}{5} + \frac{11 z}{5}$

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

$y = \frac{21}{5} + \frac{11 z}{5}$

Step 4

Simplify the right side.

Tap for more steps...

Step 4.1

Reorder $\frac{21}{5}$ and $\frac{11 z}{5}$ .

$y = \frac{11 z}{5} + \frac{21}{5}$

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

$y = \frac{11 z}{5} + \frac{21}{5}$

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