How do you implicitly differentiate: x^3y^3-y=x

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,

x= cost per bracelet

number of bracelets * x + shipping charge = total cost

so

9x+9=72