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## Homework Statement

Find the absolute maximum and minimum values of f on

the set D.

f(x,y) = 1+4x-5y

D is the closed triangular region with vertices (0,0) (2,0) (0,3)

## Homework Equations

To find the absolute maximum and minimum values of a continuous function

on a closed, bounded set :

1. Find the values of f at the critical points of f in D.

2. Find the extreme values of f on the boundary of D.

3. The largest of the values from steps 1 and 2 is the absolute maximum value;

the smallest of these values is the absolute minimum value.

## The Attempt at a Solution

So I know to find the values of f at the critical points I must take partial fx and partial fy. Which both should be 0.

But fx(x,y) = 4 and fy(x,y) = -5. How do I set those equal to 0?