+42 Consider the lines Let's say that a pair of lines is
\(\begin{align*} y&=3x+5 \\ 2y&=4x+5 \\ 3y&=9x-2 \\ 2y&=x-3 \\ 4y&=x-5. \end{align*}\)
if the two lines are either parallel or perpendicular to each other. Among all the pairs of lines shown, how many pairs are good?
