Parallel lines mean that the slopes are the same, while perpendicular means that the slopes are negative reciprocals from each other.
With this information,
1. The slopes are the same, so PARALLEL.
2. The slopes are negative reciprocals, so PERPENDICULAR.
3. Same as the second.
Answer:
I don't really know this one
I bet the ODE is supposed to read
Then if 
, we have 
and 
, and substituting these into the ODE gives
Solving for <em>r</em>, we find
so that 
and 
are two fundamental solutions to the ODE. Thus the general solution is
Given that 
and 
, we get
So the particular solution is
8 oz. is half a pound. so she will need less than a pound of chocolate.
