Instead of the classical x-y axes we have D-W.
You need to plot the line
[tex]W=7D+5[/tex]This is easy if we set
[tex]\begin{gathered} D=0\text{ then W=5} \\ D=1\text{ then W=12} \end{gathered}[/tex]Then, the pair of numbers that satisy the first inequality are those which its y component is below the graph (it will be draw with yellow)
The other inequality is similar (will be draw with blue)
[tex]\begin{gathered} D=9-6W \\ W=0\text{ then D=9} \\ W=1\text{ then D=3} \end{gathered}[/tex]The pair of numbers are those to the left of the line.
