Evaluate Using the Given Value K=a-y , y

$K = a - y$ , $y$

Rewrite the equation as $a - y = K$ .

$a - y = K$

Subtract $a$ from both sides of the equation.

$- y = K - a$

Divide each term in $- y = K - a$ by $- 1$ and simplify.

Divide each term in $- y = K - a$ by $- 1$ .

$\frac{- y}{- 1} = \frac{K}{- 1} + \frac{- a}{- 1}$

Simplify the left side.

Dividing two negative values results in a positive value.

$\frac{y}{1} = \frac{K}{- 1} + \frac{- a}{- 1}$

Divide $y$ by $1$ .

$y = \frac{K}{- 1} + \frac{- a}{- 1}$

Simplify the right side.

Simplify each term.

Move the negative one from the denominator of $\frac{K}{- 1}$ .

$y = - 1 \cdot K + \frac{- a}{- 1}$

Rewrite $- 1 \cdot K$ as $- K$ .

$y = - K + \frac{- a}{- 1}$

Dividing two negative values results in a positive value.

$y = - K + \frac{a}{1}$

Divide $a$ by $1$ .

$y = - K + a$