Explain the difference between how both light and sound travel through various mediums (solids , liquids and gasses) .

Light (and other forms of electromagnetic radiation) CAN travel through
solids, liquids, and gases, but it doesn't NEED anything to travel through. 
It can travel just as easily through complete vacuum.  That's how the heat
and light of the sun reach us.

Sound NEEDS something to travel through.  If there's nothing there, then
sound doesn't travel at all.  It can be solid, liquid, or gas, but there HAS TO
BE something there.  Otherwise sound doesn't go anywhere.  Not even an inch.

Alinear relationship would look like a straight line on the graph. it could have a positive negative or 0 slope. so it could be a line potentially going in any direction but it must be perfectly straight.

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