The given equation is:
[tex]y+9=13[/tex]Recall the Subtraction Property of Equality:
Hence, to find the value of y, subtract 9 from both sides of the equation:
[tex]\begin{gathered} y+9-9=13-9 \\ \Rightarrow y+0=4 \\ \Rightarrow y=4 \end{gathered}[/tex]The value of y is 4.