Consider the following constrained maximization problem Maximize y=x1+ 5ln x2 Subject to?

... k-x1-x2=0
Where k is a constant that can be assigned any specific value.
a. Show that if k = 1, this problem can be solved as one involving only equality constraints.
b. Show that solving this problem for k=4 requires that x1=-1.
c. C. if the x’s in this problem must be non negative, what is the optimal solution when k=4