Re: optimisation problem!!!

Graph the region on the x1-x2 plane bounded by your restraints. Find
the directional derivative of z along the edges. (since they are all
linear, this is easy to do) If they are all non-0, then check the
corners of the region for maximum profit. If any are 0, then any point
along that line is equally valid (although, you do need to choose an
integer value for x1 and x2- if the corners of the region are not
integral, you will need to figure out for yourself what to do.)

Also, note that you made an error on your z equation.

I assumed that all units should have been either tonnes or metres,
otherwise a conversion factor is needed.

.

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