Note that we replaced all the a s in 1 1 with x s to acknowledge the fact that the derivative is really a function as well. Except where otherwise noted content on this wiki is licensed under the following license. 2x Dx Dx2 Dx.
For the straight line shown in the figure the formula for the slope is y 1 y 0x 1 x 0.
But what about a function of two variables x and y. The derivative is often written as dy over dx meaning the difference in y divided by the difference. X x dx d 2 1 5. D d x f g x f g x g x.