Answer: Option 2
Step-by-step explanation:
the slope is -4, so B is the answer.
Answer: 10 3/8
Step-by-step explanation:
First find the gradient by using partial derivatives.

Sub in given point (0,-1,2) for x,y,z
∨

Next, find unit vector from directional vector (0,-1,2) --> (-3,4,-3)

Finally, use dot product on gradient and unit vector to get directional rate of change.
Answer is approx 61.398