For the pairs of lines defined by the following equations indicate with an "I" if they are identical, a "P" if they are distinct but parallel, an "N" (for "normal") if they are perpendicular, and a "G" (for "general") if they are neither parallel nor perpendicular.
$3x+4y+5=0$ and $y=-\frac{3}{4}x-\frac{5}{4}$.
$x = \sqrt{2}$ and $y=\pi$.
$y=x+1$ and $3x+5y+7=0$.
$y=-\frac{3}{4}x$ and $3x+4y+7=0$.