Which law is based on the graph that is shown below?

boyle’s law
charles’s law
dalton’s law
gay-lussac’s law

Answer is: Boyle’s law.

Boyle's Law (the pressure volume law): volume of a given amount of gas held varies inversely with the applied pressure when the temperature and mass are constant.

p₁V₁ = p₂V₂ (the product of the initial volume and pressure is equal to the product of the volume and pressure after a change).

When pressure goes up, volume goes down.

When volume goes up, pressure goes down.  

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: