We have an expression with 2 unknowns, and we have values for one unknown. We have to calculate then the other unknown value:
Expression:
[tex]\begin{gathered} y+7x=11 \\ y=11-7x \end{gathered}[/tex]Then, when x=-1
[tex]y=11-7x=11-7(-1)=11+7=18[/tex]When x=0
[tex]y=11-7(0)=11[/tex]When x=4
[tex]y=11-7(4)=11-28=-17[/tex]