Solving for a Variable: Practice

The length $l$ is multiplied by the width $w$, so divide both sides by $w$.

$l = \frac{A}{w}$

The letter $a$ is added to $x$, so subtract $a$ from both sides to undo it.

$x = b - a$

The letter $a$ is subtracted from $x$, so add $a$ to both sides.

$x = b + a$

The coefficient of $x$ is $a$, so divide both sides by $a$.

$x = \frac{b}{a}$

The variable $x$ is divided by $a$, so undo that by multiplying both sides by $a$.

$x = ab$

The perimeter is four times a side, so divide both sides by $4$.

$s = \frac{P}{4}$

The letter $c$ is subtracted from $x$, so add $c$ to both sides.

$x = y + c$

The letter $a$ is added to $b$, so subtract $a$ from both sides.

$b = c - a$

The rate $r$ is multiplied by the product $Pt$, so divide both sides by $Pt$.

$r = \frac{I}{Pt}$

The coefficient of $x$ is $m$, so divide both sides by $m$.

$x = \frac{y}{m}$

The resistance $R$ is multiplied by the current $I$, so divide both sides by $I$.

$R = \frac{E}{I}$

The diameter $d$ is multiplied by $\pi$, so divide both sides by $\pi$.

$d = \frac{C}{\pi}$