Calculus Examples

$S = 90 x - x$

Step 1

Subtract $x$ from $90 x$ .

$S = 89 x$

Step 2

To rewrite as a function of $x$ , write the equation so that $S$ is by itself on one side of the equal sign and an expression involving only $x$ is on the other side.

$f (x) = 89 x$