Graph the systems of inequalities in Problems. Introduce slack variables to convert each system of inequalities to a system of equations, and find the basic solution of the system. Construct a table (similar to Table 1) listing basic solution, the corresponding point on the graph, and whether the basic solution is feasible. (You do not need to list the intersecting lines.)
4x1 + x2 < 28
2x1 + x2 < 16
x1 + x2 < 13
xl, x2 > 0