Substitute the value of b in the equation to check which equation satisfy the value of b.
For b + 6 = 10,
[tex]\begin{gathered} 3+6=10 \\ 9\ne10 \end{gathered}[/tex]b = 3 is not solution of equation.
For b + 8 = 11,
[tex]\begin{gathered} 3+8=11 \\ 11=11 \end{gathered}[/tex]So b = 3 is solution of equation b + 8 = 11.
For equation 5 - b = 8,
[tex]\begin{gathered} 5-3=8 \\ 2\ne8 \end{gathered}[/tex]So b = 3 is not solution of equation.
For equation b - 6 = 9,
[tex]\begin{gathered} 3-6=9 \\ -3\ne9 \end{gathered}[/tex]So b = 3 is not a solution of equation.
Answer: b + 8 = 11
