The slope of the line tangent to the graph of y = 4x - x * ln(x) at the point (e,3e) is?

A) 3

B) 1/4

C) 2

D) 3e^2

differentiate y with respect to x and substitute in x=e.

If you still can't do it explain which bit is giving you trouble.

how do you substitute?

Show me what you have done?