Answer:
The equation of the sraight line 3x- y+ 6 =0
Step-by-step explanation:
Explanation:-
Given that the gradient of the function
|gradf| = 3 and point (-1,3)
Given that the slope of the line
m = 3
The equation of the straight line passing through the point(-1,3) and slope m =3

y-3 = 3(x-(-1))
y-3 = 3x+3
3x +3-y+3=0
3x- y+ 6 =0
Final answer:-
The equation of the sraight line 3x- y+ 6 =0