Hi there & welcome to brainly ! :)
Answer:
[tex] \huge{ \bold{ \boxed{ \tt{9y + 12}}}}[/tex]
Step-by-step explanation:
[tex] \sf{2y + 4 + 7y + 8}[/tex]
[tex] \text{Add \: the \: like \: terms : \: 2y \: and \: 7y }[/tex]
[tex] \text{Like \: terms \: are \: those \: which \: have \: the \: same \: base.}[/tex]
[tex] \longrightarrow{ \sf{9y + 4+ 8}}[/tex]
[tex] \text{Add \: the \: numbers: 4 \: and \: 8}[/tex]
[tex] \longrightarrow{ \boxed{ \sf{9y + 12}}}[/tex]
[tex] \text{Hope \: I \: helped!}[/tex]
[tex] \text{Best \: regards!} [/tex]
~[tex] \sf{TheAnimeGirl}[/tex]
