Correct. The x-intercept occurs where $\displaystyle{y}={0}\usepackage{cmbright}\Huge\$ . Substitute this value into $\displaystyle{6}{y}-{3}{x}=-{18}\usepackage{cmbright}\Huge\$ : $\displaystyle-{3}{x}=-{18}\usepackage{cmbright}\Huge\$ , so $\displaystyle{x}={6}\usepackage{cmbright}\Huge\$ . The x-intercept is (6, 0). The missing x-coordinate is 6.