Question

When we say \[\frac{\mathrm{d} y}{\mathrm{d} x}\], it also be written as \[\Delta x\] or \[\Delta y\]?

Answer 1

not the same thing

Answer 2

no thats different dy/dx is a derivatice
delta y and delta x are changes

Answer 3

Isn't the derivative the change? Like for dy/dx, it is the change in the y-axis for each x value?
When what are delta x and delta y?

Answer 4

the derivative can be written (in fact historically was almost always written) as
\[\lim_{\Delta x \rightarrow 0}\frac{\Delta y}{\Delta x}\]

Answer 5

put your hands 14 inches apart; \(\Delta\)x = 14 inches; as you bring your hands together that \(\Delta\)x gets smaller and smaller.

The moment your hands touch and the distance is gone; you have reached dx

Answer 6

the ghost of a departed value

Answer 7

but notice it is a limit that gives you
\[\frac{dy}{dx}\]as you take the limit, the greek letter becomes an english letter

Answer 8

god save the queen!!

Answer 9

sort of like
\[\sum\] and
\[\int\]

Answer 10

who you calling a queen?

Answer 11

♫♫...we are the champions .... ♫♫

Answer 12

oh of course.

Answer 13

what is the area of a circumference?

Answer 14

So the delta x is the change in the x value, while the dy/dx is the rate of change, the gradient. Since the gradient is the rate of change, I remember the gradient is a function that tells the increase in the y-axis for every increment of x value on the x-axis, is this right? Then this gradient tells a change in the y-axis for each increment of x value, is delta y or delta x?