Law of motion that says for every action there is an equal and opposite

These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects.

Arise 8 run 1 this means go 8 up and 1 across, which is steepest