# Pre-calculus

posted by
**Lucy**
.

Name all the values of x that are not in the domain of f(x)=2-x^2/x+5.

Answer: x= -5

2)Find the minimum value of f(x,y)=2x-y+2 for the polygonal convex set determined by this system of inequalities: x >/= 1, x </= 3, y</=0, 1/2x+y</=5

Answer: -0.5