Do You have a textbook if so you can read and tell me what you learned.
Step-by-step explanation:
a

<h2>hope it helps.</h2><h2>stay safe healthy and happy...</h2>
Answer: A <em>plane </em>
This needs to be 20 characters long so this is ok
Hi
2/3 y+y-4=31
Simplify both sides of the equation
2/3 y-4=31
Combine like terms
(2/3 y+y)+(-4)=31
5/3 y-4=31
Add 4 to both sides
5/3 y-4+4=31+4
5/3 y=35
Multiply both sides 3/5
(3/5)*(5/3 y)=(3/5)*35
y=21
I hope that's help !