is useless now i get no help in hw like someone pls help

Plug the point (-1,20) into the equation and see if it holds true.

20<1/2(-1-5)^2+2
20<1/2(-6)^2+2
20<1/2(36)+2
20<18+2
20<20
So it’s true. I left the equals sign out because I couldn’t do it on my phone. The symbol in the question is less than or equal to and it is equal so yes

You have to leave Y by itself in one side. To do that, you need to subtract 2x from both sides. You're now left with -3y = 8-2x. Last step is that you divide 3y, 8, and -2 by -3. 

Good luck :)