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why are my answers wrong? :(

for part a) you should have dy =16xh+31h

why have 31 h?

i thought we leave the constant alone?

oh because it was an x because finding the derivative?

compared with
\[ d (y = 31 x ) \\
dy = 31\ dx \]

yes it ='s to 1

right.

but i was confused why i couldn't leave 31 alone

and why i had to add h in the end..

oh okay, got cha.

what if it had like an x and a y inside

could i still apply this?

it would be the same idea, but you use "partial derivatives"

ex: dy/dx

so (d/dx+dy/dx)h ?

do you have a specific question?

well i know that we have to do this: 2x*y(dy/dx) +2y*(d/dx).. right?

But you won't see those type of problems.

oh okay, thank you so much! :)