Incorrect. Use the graph to map different values of x. When $\displaystyle{x}={1}\usepackage{cmbright}\Huge\$ , is $\displaystyle{3}{x}-{1}\ge-{2.5}\usepackage{cmbright}\Huge\$ ? What about when $\displaystyle{x}={0}\usepackage{cmbright}\Huge\$ ? When $\displaystyle{x}=-{2}\usepackage{cmbright}\Huge\$ ? Notice that the entire line of $\displaystyle{3}{x}-{1}\ge-{2.5}\usepackage{cmbright}\Huge\$ does not lie inside the shaded region $\displaystyle{y}\ge-{2.5}\usepackage{cmbright}\Huge\$ .