Ans: D
Note that the slope of the straight line $2x+7y=5$ is $\dfrac{-2}{7}$. Note also that the slope of all lines perpendicular to $2x+7y=5$
Note that the slope of the straight line $2x+7y=5$ is $\dfrac{-2}{7}$. Note also that the slope of all lines perpendicular to $2x+7y=5$
$\begin{array}{cl}
= & -1 \div \dfrac{-2}{7} \\
= & \dfrac{7}{2}
\end{array}$
A is not correct. The slope of the straight line is $\dfrac{-2}{7}$.
B is not correct. The slope of the straight line is $\dfrac{2}{7}$.
C is not correct. The slope of the straight line is $\dfrac{-7}{2}$.
D is correct. The slope of the straight line is $\dfrac{7}{2}$.
