The profit on the sale of a bicycle at a bike shop is $35, while the profit on the sale of a tricycle is $21. The owner is interested in making more than $210 in profit per day, and expects to sell at most 8 items per day. The system that represents this situation is $\displaystyle{b}+{t}\le{8}\usepackage{cmbright}\Huge\$ and $\displaystyle{35}{b}+{21}{t}>{210}\usepackage{cmbright}\Huge\$ . The graph of the boundary lines is shown below. Which region should be shaded (to form the solution)?