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4-110.

Solve each equation below for the indicated variable.

$y=mx+b$ for $m$
Answer (a):
$y - b = mx$
$\frac{y - b} x = m$

$C=2\pi r$ for $r$
Step 1 (b):
Divide both sides by $2\pi$ .
Answer (b):
$\frac{c}{2 \pi} = r$

$V=LHW$ for $L$
Hint (c):
To solve for $L$ divide both sides of the equation by ( $HW$ ).

$\frac{1}{y}-3x=7$ for $y$
Step 1 (d):
Add $3x$ to both sides.
$\frac{1}{y} = 3x + 7$
Step 2 (d):
Multiply by $y$ on both sides.
$1 = y(3x + 7)$
Step 3 (d):
How can you get $y$ by itself?
Answer (d):
$\frac{1}{7 + 3x} = y$

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