CPM Homework Help : CCG Problem 3-6

Solve each equation below for $x$ . Show all work and check your answer by substituting it back into the equation and verifying that it makes the equation true.

Hint:

How can you re-write the equation without using fractions? Now, try to solve.

$\frac{x}{3}=6$
Answer (a):
$x=6·3$
So, $x=18$

$\frac{5x+9}{2}=12$
Steps (b):
$\begin{array}{l} 5x + 9 = 12(2)\\ \quad \;\;\, 5x = 24 - 9\\ \quad \;\;\, 5x = 15\\ \qquad \, x = 3 \end{array}$

$\frac{x}{4}=\frac{9}{6}$
Hint (c):
Refer to the hint above.

$\frac{5}{x}=\frac{20}{8}$
Hint (d):
Refer to the hint above.