Find the absolute minimum and absolute maximum of $$f(x,y) = 5 - 7 x + 8 y$$ on the closed triangular region with vertices $(0,0), (8, 0)$ and $(8, 12)$.

List the minimum/maximum values as well as the point(s) at which they occur. If a min or max occurs at multiple points separate the points with commas.

Minimum value:
Occurs at

Maximum value:
Occurs at