Final answer:
According to Newton's third law of motion, the force applied by the person on the wall and the force applied by the wall on the person are equal in magnitude and opposite in direction.
Step-by-step explanation:
If you are leaning against the wall, the force that you apply on the wall is equal to the force that the wall applies to you. This is a direct consequence of Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When you push against the wall, the wall pushes back with an equal force in the opposite direction. These forces are equal in magnitude and opposite in direction, and they act on different systems, meaning they do not cancel each other out. Therefore, the force you apply is equal to the force that the wall applies to you.