You should plug the x and y values into the original equations to get your b value. You should get a b value of 7. Your new equation should be y=2x+7
Answer:

Step-by-step explanation:
we have given thickness of atmosphere =50 km
radius of earth =6400 km
average temperature of atmosphere=15°C
Average pressure of atmosphere= 0.20 atm
we have to calculate the volume of atmosphere
so the we have to calculate the volume of atmosphere = ( volume of earth +atmosphere) - volume of earth
volume of atmosphere =
=
With these, I normally use the method of "Plug and Chug" lol. I think your answer is C. -6.