CPM Homework Help : CC3 Problem 3-23

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3-23.

Find the value of $x$ that makes each equation below true.

$x+7=2$
Hint (a):
Subtract $7$ from both sides.
Answer (a):
$x=-5$

$-5=\frac{1}{2}x$
Hint (b):
Divide both sides by one half (this is equivalent to multiplying by $2$ ).

$3x=-45$
Hint (c):
Divide both sides by $3$ .

$2=-x$
Hint (d):
Divide both sides by $−1$ .

$-5=\frac{x}{2}$
Hint (e):
Multiply both sides by $2$ .

$x^2=9$ (all possible values for $x$ )
Hint (f):
Find the square root of both sides. Remember to include both the positive and negative values as you are taking the square root of a variable.

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