Is x+3y=24 perpendicular, parallel, or neither?

You 1st need to change that line into y=mx+b, then you can see what the slope is, once you have done that you will need to find it's inverse which you will do by following these steps:
1. change f(x) to y
2.swap x for y
3. solve for y
once that is done you will be able to see the slope of the inverse and when you compare it to the original line, they are the same, therefore parallel.  

The answer is 3. parallelogram

Ibelieve the answer is c