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The values of the slope of a line is a measure of the amount of change in the dependent (vertical) variable which accompanies a unit change in the ndependent (horizontal) variable.
It is usual to plot the values of the dependent variable on the y-axis. That is what you measure when you change something else, the independent variable.
Not exactly sure what you mean by "can't change." However, I if I do understand you correctly, the dependent variable CAN change. The dependent variable will change according to the independent variable's value and overall effect. For example, in an experiment involving water's effect on plants, the dependent variable may be the height of the plant or the glucose produced. Based on the amount of the independent variable (represented on the x axis of a data graph), the dependent variable will increase or decrease. In this case, both dependent values (glucose and height) would probably increase.
no because you don't controll it but if you change the independent the dependent will change.
Independent variables are variables that can be changed in an experiment, while dependent variables are variables that change as a result of an experiment. In other words, independent variables are what you change, and dependent variables are the results of the experiment.