Question

Wondering if my answer is right (which is probably isn't... lol)

Answer 1

xy + 8x + 8y = 8
a) Differentiate both sides with respect to x to complete the following
(_____)y'+y+____=0

b) Solve for y ' in terms of x and y.
y'=___ c)

(c) Calculate dy/dx at the point (4,-2).

Answer 2

my answers:
a) (x) ... (8yy')
B) y'=-8-y/x+8y
c)1/2

Answer 3

d/dx of y is just y'

Answer 4

so i think , other 2 will also be incorrect....

Answer 5

i just subbed my points into my b answer.
a is the one that confuses me ..

Answer 6

d/dx (8y) is just 8y'

Answer 7

xy + 8x + 8y = 8
xy'+y + 8 + 8y' = 0

Answer 8

oh i see what i did wrong there.

Answer 9

B) y'=(-8-y)/(x+8)

Answer 10

got that ^ ?

Answer 11

yah i didn't have b right because i had a messed up

Answer 12

what about c ?

Answer 13

so now i just sub my points into b?

Answer 14

i still get a half.

Answer 15

awesome!!! : )

Answer 16

- half ?

Answer 17

i had a positive number

Answer 18

no wait it's negative.

Answer 19

yes. its negative.