Answer:
9x+9
Step-by-step explanation
Combine like terms (6x and 3x, 2 and 7)
Are you trying write it into slope intercept form ?
Answer:
Closure property
Step-by-step explanation:
The closure property of polynomials for addition says that, if we add any two polynomials , the result is also a polynomial.
For is

is a polynomial.

is also a polynomial.
The sum of the two polynomials is

The result:

is also a polynomial.
Yes. Because blah blah blas blah blah blah
XD