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

## Abstract

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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