Example of ceteris paribus assumption?

Prices of substitute and complement goods are held constant in the demand curve for a good. As well as Interest rates, savings, people's preferences, and people's knowledge about everything but one...

yes

it isolates are factors and only look at one cause and effect at a time. This is why the demand curve is a liner equation (straight line). It wouldn't be possible in real life.

economist used ceteris paribus To separate cause and effect by holding all other things constant

Ceteris paribus is Latin phrase meaning, approximately, "holding other things constant."