I assume you mean 2 times y times y times y. Since y is multiplied by itself three times, you have 2 times y3, also known as 2 times y cubed, which is written as 2y3.
The line Y=2 is a horizontal line at positive 2..
So the Y intercept is 2.
Think of a normal line equation.
Y=mX+b
B is the y intercept, and since there is no "mx" term, m, which is the slope,...