Friday, April 24, 2015

College Algebra, Chapter 1, 1.1, Section 1.1, Problem 28

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

$
\begin{equation}
\begin{aligned}
2x - \frac{x}{2} + \frac{x+1}{4} &= 6x && \text{Get the LCD of the left side}\\
\\
\frac{8x - 2x + x + 1}{4} &= 6x && \text{Simplify}\\
\\
\frac{7x+1}{4} &= 6x && \text{Group}\\
\\
\frac{7x}{4} + \frac{1}{4} &= 6x && \text{Combine like terms}\\
\\
\frac{7x}{4} - 6x &= \frac{-1}{4} && \text{Get the LCD of the left side}\\
\\
\frac{7x-24x}{4} &= \frac{-1}{4} && \text{Simplify}\\
\\
\frac{-17x}{4} &= \frac{-1}{4} && \text{Multiply both sides by -4}\\
\\
-\cancel{4}& \left[ \frac{-17x}{\cancel{4}}= \frac{-1}{4} \right] - \cancel{4} && \text{Simplify}\\
\\
17x &= 1 && \text{Divide both sides by 17}\\
\\
\frac{\cancel{17}x}{\cancel{17}} &= \frac{1}{17} && \text{Simplifty}\\
\\
x &= \frac{1}{17}
\end{aligned}
\end{equation}
$

No comments:

Post a Comment

Why is the fact that the Americans are helping the Russians important?

In the late author Tom Clancy’s first novel, The Hunt for Red October, the assistance rendered to the Russians by the United States is impor...