Correct. If $\displaystyle{9}{x}+{y}={25}\usepackage{cmbright}\Huge\$ , then $\displaystyle{y}=-{9}{x}+{25}\usepackage{cmbright}\Huge\$ and this line has slope -9. Since the line $\displaystyle{y}={9}{x}+{13}\usepackage{cmbright}\Huge\$ has slope 9, the two lines are not parallel.