Finite Math Examples

$2 x + 2 y - z = 7$ , $x - 3 y + z = 24$

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 $2 y$ from both sides of the equation.

$2 x - z = 7 - 2 y$

$x - 3 y + z = 24$

Step 1.1.2

Add $z$ to both sides of the equation.

$2 x = 7 - 2 y + z$

$x - 3 y + z = 24$

$2 x = 7 - 2 y + z$

$x - 3 y + z = 24$

Step 1.2

Divide each term in $2 x = 7 - 2 y + z$ by $2$ and simplify.

Tap for more steps...

Step 1.2.1

Divide each term in $2 x = 7 - 2 y + z$ by $2$ .

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

$x - 3 y + z = 24$

Step 1.2.2

Simplify the left side.

Tap for more steps...

Step 1.2.2.1

Cancel the common factor of $2$ .

Tap for more steps...

Step 1.2.2.1.1

Cancel the common factor.

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

$x - 3 y + z = 24$

Step 1.2.2.1.2

Divide $x$ by $1$ .

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

$x - 3 y + z = 24$

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

$x - 3 y + z = 24$

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

$x - 3 y + z = 24$

Step 1.2.3

Simplify the right side.

Tap for more steps...

Step 1.2.3.1

Cancel the common factor of $- 2$ and $2$ .

Tap for more steps...

Step 1.2.3.1.1

Factor $2$ out of $- 2 y$ .

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

$x - 3 y + z = 24$

Step 1.2.3.1.2

Cancel the common factors.

Tap for more steps...

Step 1.2.3.1.2.1

Factor $2$ out of $2$ .

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

$x - 3 y + z = 24$

Step 1.2.3.1.2.2

Cancel the common factor.

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

$x - 3 y + z = 24$

Step 1.2.3.1.2.3

Rewrite the expression.

$x = \frac{7}{2} + \frac{- y}{1} + \frac{z}{2}$

$x - 3 y + z = 24$

Step 1.2.3.1.2.4

Divide $- y$ by $1$ .

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

$x - 3 y + z = 24$

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

$x - 3 y + z = 24$

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

$x - 3 y + z = 24$

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

$x - 3 y + z = 24$

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

$x - 3 y + z = 24$

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

$x - 3 y + z = 24$

Step 2

Solve the equation for $z$ .

Tap for more steps...

Step 2.1

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

Tap for more steps...

Step 2.1.1

Subtract $3 y$ from $- y$ .

$\frac{7}{2} - 4 y + \frac{z}{2} + z = 24$

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

Step 2.1.2

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

$\frac{7}{2} - 4 y + \frac{z}{2} + z \cdot \frac{2}{2} = 24$

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

Step 2.1.3

Simplify terms.

Tap for more steps...

Step 2.1.3.1

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

$\frac{7}{2} - 4 y + \frac{z}{2} + \frac{z \cdot 2}{2} = 24$

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

Step 2.1.3.2

Combine the numerators over the common denominator.

$\frac{7}{2} - 4 y + \frac{z + z \cdot 2}{2} = 24$

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

Step 2.1.3.3

Combine the numerators over the common denominator.

$- 4 y + \frac{7 + z + z \cdot 2}{2} = 24$

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

$- 4 y + \frac{7 + z + z \cdot 2}{2} = 24$

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

Step 2.1.4

Move $2$ to the left of $z$ .

$- 4 y + \frac{7 + z + 2 z}{2} = 24$

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

Step 2.1.5

Add $z$ and $2 z$ .

$- 4 y + \frac{7 + 3 z}{2} = 24$

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

Step 2.1.6

To write $- 4 y$ as a fraction with a common denominator, multiply by $\frac{2}{2}$ .

$- 4 y \cdot \frac{2}{2} + \frac{7 + 3 z}{2} = 24$

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

Step 2.1.7

Combine $- 4 y$ and $\frac{2}{2}$ .

$\frac{- 4 y \cdot 2}{2} + \frac{7 + 3 z}{2} = 24$

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

Step 2.1.8

Combine the numerators over the common denominator.

$\frac{- 4 y \cdot 2 + 7 + 3 z}{2} = 24$

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

Step 2.1.9

Multiply $2$ by $- 4$ .

$\frac{- 8 y + 7 + 3 z}{2} = 24$

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

Step 2.1.10

Factor $- 1$ out of $- 8 y$ .

$\frac{- (8 y) + 7 + 3 z}{2} = 24$

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

Step 2.1.11

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

$\frac{- (8 y) - 1 \cdot - 7 + 3 z}{2} = 24$

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

Step 2.1.12

Factor $- 1$ out of $- (8 y) - 1 (- 7)$ .

$\frac{- (8 y - 7) + 3 z}{2} = 24$

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

Step 2.1.13

Factor $- 1$ out of $3 z$ .

$\frac{- (8 y - 7) - (- 3 z)}{2} = 24$

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

Step 2.1.14

Factor $- 1$ out of $- (8 y - 7) - (- 3 z)$ .

$\frac{- (8 y - 7 - 3 z)}{2} = 24$

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

Step 2.1.15

Simplify the expression.

Tap for more steps...

Step 2.1.15.1

Rewrite $- (8 y - 7 - 3 z)$ as $- 1 (8 y - 7 - 3 z)$ .

$\frac{- 1 (8 y - 7 - 3 z)}{2} = 24$

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

Step 2.1.15.2

Move the negative in front of the fraction.

$- \frac{8 y - 7 - 3 z}{2} = 24$

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

$- \frac{8 y - 7 - 3 z}{2} = 24$

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

$- \frac{8 y - 7 - 3 z}{2} = 24$

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

Step 2.2

Multiply both sides of the equation by $- 2$ .

$- 2 (- \frac{8 y - 7 - 3 z}{2}) = - 2 \cdot 24$

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

Step 2.3

Simplify both sides of the equation.

Tap for more steps...

Step 2.3.1

Simplify the left side.

Tap for more steps...

Step 2.3.1.1

Simplify $- 2 (- \frac{8 y - 7 - 3 z}{2})$ .

Tap for more steps...

Step 2.3.1.1.1

Cancel the common factor of $2$ .

Tap for more steps...

Step 2.3.1.1.1.1

Move the leading negative in $- \frac{8 y - 7 - 3 z}{2}$ into the numerator.

$- 2 \frac{- (8 y - 7 - 3 z)}{2} = - 2 \cdot 24$

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

Step 2.3.1.1.1.2

Factor $2$ out of $- 2$ .

$2 (- 1) (\frac{- (8 y - 7 - 3 z)}{2}) = - 2 \cdot 24$

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

Step 2.3.1.1.1.3

Cancel the common factor.

$2 \cdot (- 1 \frac{- (8 y - 7 - 3 z)}{2}) = - 2 \cdot 24$

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

Step 2.3.1.1.1.4

Rewrite the expression.

$8 y - 7 - 3 z = - 2 \cdot 24$

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

$8 y - 7 - 3 z = - 2 \cdot 24$

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

Step 2.3.1.1.2

Multiply.

Tap for more steps...

Step 2.3.1.1.2.1

Multiply $- 1$ by $- 1$ .

$1 (8 y - 7 - 3 z) = - 2 \cdot 24$

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

Step 2.3.1.1.2.2

Multiply $8 y - 7 - 3 z$ by $1$ .

$8 y - 7 - 3 z = - 2 \cdot 24$

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

$8 y - 7 - 3 z = - 2 \cdot 24$

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

$8 y - 7 - 3 z = - 2 \cdot 24$

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

$8 y - 7 - 3 z = - 2 \cdot 24$

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

Step 2.3.2

Simplify the right side.

Tap for more steps...

Step 2.3.2.1

Multiply $- 2$ by $24$ .

$8 y - 7 - 3 z = - 48$

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

$8 y - 7 - 3 z = - 48$

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

$8 y - 7 - 3 z = - 48$

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

Step 2.4

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

Tap for more steps...

Step 2.4.1

Subtract $8 y$ from both sides of the equation.

$- 7 - 3 z = - 48 - 8 y$

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

Step 2.4.2

Add $7$ to both sides of the equation.

$- 3 z = - 48 - 8 y + 7$

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

Step 2.4.3

Add $- 48$ and $7$ .

$- 3 z = - 8 y - 41$

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

$- 3 z = - 8 y - 41$

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

Step 2.5

Divide each term in $- 3 z = - 8 y - 41$ by $- 3$ and simplify.

Tap for more steps...

Step 2.5.1

Divide each term in $- 3 z = - 8 y - 41$ by $- 3$ .

$\frac{- 3 z}{- 3} = \frac{- 8 y}{- 3} + \frac{- 41}{- 3}$

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

Step 2.5.2

Simplify the left side.

Tap for more steps...

Step 2.5.2.1

Cancel the common factor of $- 3$ .

Tap for more steps...

Step 2.5.2.1.1

Cancel the common factor.

$\frac{- 3 z}{- 3} = \frac{- 8 y}{- 3} + \frac{- 41}{- 3}$

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

Step 2.5.2.1.2

Divide $z$ by $1$ .

$z = \frac{- 8 y}{- 3} + \frac{- 41}{- 3}$

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

$z = \frac{- 8 y}{- 3} + \frac{- 41}{- 3}$

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

$z = \frac{- 8 y}{- 3} + \frac{- 41}{- 3}$

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

Step 2.5.3

Simplify the right side.

Tap for more steps...

Step 2.5.3.1

Simplify each term.

Tap for more steps...

Step 2.5.3.1.1

Dividing two negative values results in a positive value.

$z = \frac{8 y}{3} + \frac{- 41}{- 3}$

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

Step 2.5.3.1.2

Dividing two negative values results in a positive value.

$z = \frac{8 y}{3} + \frac{41}{3}$

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

$z = \frac{8 y}{3} + \frac{41}{3}$

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

$z = \frac{8 y}{3} + \frac{41}{3}$

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

$z = \frac{8 y}{3} + \frac{41}{3}$

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

$z = \frac{8 y}{3} + \frac{41}{3}$

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

Step 3

Simplify the right side.

Tap for more steps...

Step 3.1

Simplify $\frac{7}{2} - y + \frac{\frac{8 y}{3} + \frac{41}{3}}{2}$ .

Tap for more steps...

Step 3.1.1

Combine the numerators over the common denominator.

$x = - y + \frac{7 + \frac{8 y}{3} + \frac{41}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.2

To write $7$ as a fraction with a common denominator, multiply by $\frac{3}{3}$ .

$x = - y + \frac{\frac{8 y}{3} + 7 \cdot \frac{3}{3} + \frac{41}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.3

Combine $7$ and $\frac{3}{3}$ .

$x = - y + \frac{\frac{8 y}{3} + \frac{7 \cdot 3}{3} + \frac{41}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.4

Combine the numerators over the common denominator.

$x = - y + \frac{\frac{8 y}{3} + \frac{7 \cdot 3 + 41}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.5

Simplify the numerator.

Tap for more steps...

Step 3.1.5.1

Multiply $7$ by $3$ .

$x = - y + \frac{\frac{8 y}{3} + \frac{21 + 41}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.5.2

Add $21$ and $41$ .

$x = - y + \frac{\frac{8 y}{3} + \frac{62}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = - y + \frac{\frac{8 y}{3} + \frac{62}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.6

Simplify each term.

Tap for more steps...

Step 3.1.6.1

Simplify the numerator.

Tap for more steps...

Step 3.1.6.1.1

Combine the numerators over the common denominator.

$x = - y + \frac{\frac{8 y + 62}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.6.1.2

Factor $2$ out of $8 y + 62$ .

Tap for more steps...

Step 3.1.6.1.2.1

Factor $2$ out of $8 y$ .

$x = - y + \frac{\frac{2 (4 y) + 62}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.6.1.2.2

Factor $2$ out of $62$ .

$x = - y + \frac{\frac{2 (4 y) + 2 (31)}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.6.1.2.3

Factor $2$ out of $2 (4 y) + 2 (31)$ .

$x = - y + \frac{\frac{2 (4 y + 31)}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = - y + \frac{\frac{2 (4 y + 31)}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = - y + \frac{\frac{2 (4 y + 31)}{3}}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.6.2

Multiply the numerator by the reciprocal of the denominator.

$x = - y + \frac{2 (4 y + 31)}{3} \cdot \frac{1}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.6.3

Cancel the common factor of $2$ .

Tap for more steps...

Step 3.1.6.3.1

Cancel the common factor.

$x = - y + \frac{2 (4 y + 31)}{3} \cdot \frac{1}{2}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.6.3.2

Rewrite the expression.

$x = - y + \frac{4 y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = - y + \frac{4 y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = - y + \frac{4 y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.7

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

$x = - y \cdot \frac{3}{3} + \frac{4 y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.8

Simplify terms.

Tap for more steps...

Step 3.1.8.1

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

$x = \frac{- y \cdot 3}{3} + \frac{4 y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.8.2

Combine the numerators over the common denominator.

$x = \frac{- y \cdot 3 + 4 y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = \frac{- y \cdot 3 + 4 y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.9

Simplify the numerator.

Tap for more steps...

Step 3.1.9.1

Multiply $3$ by $- 1$ .

$x = \frac{- 3 y + 4 y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

Step 3.1.9.2

Add $- 3 y$ and $4 y$ .

$x = \frac{y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = \frac{y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = \frac{y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$

$x = \frac{y + 31}{3}$

$z = \frac{8 y}{3} + \frac{41}{3}$