We know that
• Model A requires 3 hours of stain and 2 hours to assemble.
,
• Model B requires 5 hours of stain and 1 hour to assemble.
,
• The total amount of time for staining is 22 hours.
,
• The total amount of time for assembly is 11 hours.
Using the given information, we can express the following
Where x is model A and y is model B. The first inequality represents the staining process and the second inequality represents the assembly process.
The image below shows the graph of the system of inequalities.
Observe that the area of the solution to the system is in the first quadrant because it can't be negative.