## College Algebra 7th Edition

(a) $\displaystyle \frac{x}{2}+2x=10$ is the same as $\displaystyle \frac{5}{2}x-10=0$, which is linear. (b) $\displaystyle \frac{2}{x}-2x=1$ is not linear because it has the term $x^{-1}$ and linear equations can't have negative powers of $x$. (c) $x+7=5-3x$ is the same as $4x+2=0$, which is linear.