Answer: The amount of salt- independent variable
The boiling point of water- dependent variable
Step-by-step explanation:
An independent variable can be manipulated manually in an experiment the result of this manipulation can be observed on the dependent variable. The dependent changes with respect to the independent variable.
In the given experiment the amount of salt is the independent variable as the amount of the salt can be changed or manipulated. The effect of such change can be observed on the dependent variable that is the boiling point of water.