Answer:
A
Step-by-step explanation:
We have the equation:

Take the derivative of both sides with respect to x:
![\frac{d}{dx}[x^2+xy-3y]=\frac{d}{dx}[3]](https://tex.z-dn.net/?f=%5Cfrac%7Bd%7D%7Bdx%7D%5Bx%5E2%2Bxy-3y%5D%3D%5Cfrac%7Bd%7D%7Bdx%7D%5B3%5D)
Implicitly differentiate:

Solve for dy/dx:

Divide:

To find dy/dx at (2, 1), substitute 2 for x and 1 for y. So:

Hence, our answer is A.
Yes I think that is what you do but others can elaborate more im sure
1)2(m+3)=-6
2m+6=-6
2m=-6-6
2m=-12
M=-12/2=-6
2)2m+6=-6
2m=-6-6
2m=-12
M=-12/2=-6
3)2m+6-6=-6-6
2m=-12
M=-12/2=-6
4)2m=-12
M=-12/2=-6
Answer:
(1/2)sin(2x) + C
Step-by-step explanation:

Step-by-step explanation:
one could be that all the angles add up to 180
180-71= 109
∠DBC and ∠ABC must add up to 109 degrees