Hey there!
f(x) = 2x/3 + 12
y = 2x/3 + 12
y = 2(6)/3 + 12
y = 12/3 + 12
y = 4 + 12
y = 16
Therefore, your answer is: f(x) aka y = 16
Good luck on your assignment and enjoy your day!
~Amphitrite1040:)
