Answer:
The result
.
is a polynomial.
Step-by-step explanation:
The first polynomial is
.
The second polynomial is 
The closure property of multiplication states that if we multiply two polynomials the result must be a polynomial.
The product of these two polynomials is :
.
We can see that the result is still a polynomial.
Answer:
1. x=-9-7y
2. x = 120
Step-by-step explanation: