CPM Homework Help : CCA2 Problem 1-91

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1-91.

Solve each equation below for the indicated variable.

$y=mx+b$ for $x$
Hint (a):
Refer to part (c) of problem 1-37 (Lesson 1.1.3).

$A=\pi r^2$ for $r$
Step 1(b):
Divide both sides by $\pi$ .
$\frac{A}{\pi}=r^2$
Step 2(b):
Take the square root of both sides.
Answer (b):
$\sqrt{\frac{A}{\pi}}=r$

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

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

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