Question

how do I find the correct answer for the two blanks?

Answer 1

$\begin{gathered} \frac{P^{\prime}R^{\prime}}{PR}=\frac{3-1}{6-2}=\frac{2}{4}=\frac{1}{2} \\ \\ \frac{P^{\prime}S^{\prime}}{PS}=\frac{5-1}{10-2}=\frac{4}{8}=\frac{1}{2} \end{gathered}$