Question 1188471
<pre>
              PRICE         QUANTITY           COST

Pork           180            p                180p

Beef           220            b                220b

                            at least 30       at most 12000
</pre>
You can figure how to graph the system anyhow you want.
{{{system(p+b>=30,180p+220b<=12000)}}}


Only positive values for p and b are allowed.