Incorrect. One way of representing this scenario is through a table:

	Earnings	=	Rate	*	Time
Asa	$\displaystyle{528}-{e}\usepackage{cmbright}\Huge\$	=	12	*	t
Bella	$\displaystyle{e}\usepackage{cmbright}\Huge\$	=	9.75	*	$\displaystyle{50}-{t}\usepackage{cmbright}\Huge\$

Now you can use the substitution method to solve for t, the number of hours that Asa worked: $\displaystyle{528}-{\left[{9.75}\cdot{\left({50}-{t}\right)}\right]}={12}\cdot{t}\usepackage{cmbright}\Huge\$ . What value do you get for t? For $\displaystyle{50}-{t}\usepackage{cmbright}\Huge\$ ?