What is -5/7 as a decimal

Recall the definition of a polynomial expression. find two polynomial expressions whose quotient, when simplified, is. use that division problem to determine whether polynomials are closed under division. then describe how theother three operations-addition, subtraction, and multiplication-are different from division of polynomials.

How do you answer this question? (step by step)

X+ y = 5 ; x - y =3 solve using linear combination