Hey there!
In order to find the answer to this question you can do the distributive property to solve this particular problem
[tex]-3(y) = -3
\\ \\ -3(5) = 15
\\ \\
-3y + (-15)
\\ \\ \\ \\
3(2y) = 6y
\\ \\
3(6) = 18
\\ \\ \\ \\ \\
-3y + -15 + 6y + 18 [/tex]
Once when we do the distributive property we move onto the like terms
Our Like terms: [tex]-3y + 6y \\ and \\ -15 + 18 [/tex]
So, lets solve our like terms
[tex]-3y + 6y = 3y \\ \\ \\ -15 + 18 = 3 [/tex]
Finally! we came to our answer
[tex]Answer: 3y + 3 [/tex]
Good luck on your assignment and enjoy your day
~[tex]LoveYourselfFirst:)[/tex]