Incorrect. Using the table, you can set up the following system of equations:

$\displaystyle{e}={10}\cdot{t}\usepackage{cmbright}\Huge\$

$\displaystyle{310}-{e}={8}\cdot{\left({34}-{t}\right)}\usepackage{cmbright}\Huge\$

Now you can use the substitution method to solve for t, the number of hours that Adam worked: $\displaystyle{310}-{\left({10}{t}\right)}={8}\cdot{\left({34}-{t}\right)}\usepackage{cmbright}\Huge\$ . What value do you get for t? For $\displaystyle{34}-{t}\usepackage{cmbright}\Huge\$ ?