Calculus Made Easy: Being a Very-Simplest Introduction to those Beautiful Methods of Reckoning which are Generally called by the Terrifying names of the Differential Calculus and the Integral Calculus pp 22-29 | Cite as
Next Stage. What to do with Constants
In our equations we have regarded x as growing, and as a result of x being made to grow y also changed its value and grew. We usually think of x as a quantity that we can vary; and, regarding the variation of x; as a sort of cause, we consider the resulting variation of y as an effect. In other words, we regard the value of y as depending on that of x. Both x and y are variables, but x is the one that we operate upon, and y is the “ dependent variable”. In all the preceding chapter we have been trying to find out rules for the proportion which the dependent variation in y bears to the variation independently made in x.
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