I'm not sure how to write the differential equation that correponds to the following statement:

I'm not sure what is meant by 'varies jointly' in mathematical terms.Quote:

The rate of change of y with respect to x varies jointly as x and L-y

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- April 17th 2010, 11:00 AMadkinsjrI need to write this DE
I'm not sure how to write the differential equation that correponds to the following statement:

Quote:

The rate of change of y with respect to x varies jointly as x and L-y

- April 17th 2010, 12:07 PMwonderboy1953I love Googling
Got the following from a website:

"Joint variation means directly, but with two or more variables. An example would be the formula for the area of a triangle with base*b*and height*h*: http://www.purplemath.com/modules/variatn/variat04.gif. In words, the area*A***varies****jointly**with*b*and*h*; the constant of variation is*k*= 1/2."