Question

Hi,
I don't have any question specifically but I'm very confused on this.
In integration to find area under/above a curve, when do you integrate:
1) with respect to y
2) with respect to x
3) using x coordinates
4) using y coordinates

Thanks for your help! :)

Answer 1

Look at the piecemeal unit of dArea you are integrating. Is is some y dx or xdy? It is those little differential areas you are integrating.

Here is a x dy dArea.
http://education.yahoo.com/homework_help/math_help/solutionimages/minicalcgt/6/1/1/minicalcgt_6_1_1_3_50/f-413-21.gif

Answer 2

Thanks ^^