Answer:
The amount of salt solution.
Explanation:
so first you have to think about it as a y = mx + b function, where m and x are constants. So basically the independent variable is represented by the amount of salt solution because the health of the patient is affected by the amount of salt solution. this is how you would write it out as an equation so you can understand it better.
The Health of the patient = The amount of salt solution + b
Since y depends on the values of m, x, and b, The amount of salt solution would be the independent variable.
