Thursday, July 16, 2015

College Algebra, Chapter 1, 1.1, Section 1.1, Problem 36

The equation $\displaystyle \frac{2}{3} x - \frac{1}{4} = \frac{1}{6} x - \frac{1}{9} $ is either linear or equivalent to a linear equation. Solve the equation

$
\begin{equation}
\begin{aligned}
\frac{2}{3} x - \frac{1}{4} &= \frac{1}{6} x - \frac{1}{9} && \text{Combine like terms}\\
\\
\frac{2x}{3} - \frac{x}{6} &= \frac{1}{4} - \frac{1}{9} && \text{Get the LCD}\\
\\
\frac{4x-x}{6} &= \frac{9-4}{36} && \text{Simplify}\\
\\
\frac{3x}{6} &= \frac{5}{36} && \text{Multiply both sides by } \frac{6}{3}\\
\\
\frac{\cancel{6}}{\cancel{3}} & \left[ \frac{\cancel{3}x}{\cancel{6}} = \frac{5}{36} \right] \frac{6}{3} && \text{Simplify}\\
\\
x &= \frac{5}{(6)(3)} && \text{Simplify}\\
\\
x &= \frac{5}{18}
\end{aligned}
\end{equation}
$

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