Finite Math Examples

$x - 2 y = 6$ , $y + 2 x - 21$

Step 1

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

$x = 6 + 2 y$

Step 2

Replace the variable $x$ with $6 + 2 y$ in the expression.

$y + 2 (6 + 2 y) - 21$

Step 3

Simplify each term.

Tap for more steps...

Step 3.1

Apply the distributive property.

$y + 2 \cdot 6 + 2 (2 y) - 21$

Step 3.2

Multiply $2$ by $6$ .

$y + 12 + 2 (2 y) - 21$

Step 3.3

Multiply $2$ by $2$ .

$y + 12 + 4 y - 21$

Step 4

Simplify by adding terms.

Tap for more steps...

Step 4.1

Add $y$ and $4 y$ .

$5 y + 12 - 21$

Step 4.2

Subtract $21$ from $12$ .

$5 y - 9$