Suppose now that every unit of product A that is produced requires
the use of 4 shovels as well as 2 workers and that every unit of product B
produced requires 2 shovels and 4 workers. On the graph you have just
drawn, use red ink to shade in the area depicting combinations of A and
B that could be produced with 180 shovels if there were no worries about
the labor supply. Write down an equation for the set of combinations of
A and B that require exactly 180 shovels and unlimited labor supply