with 2-5 and if i’m wrong with one of them PLEASE

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

Do you mind if you guys me with this question i’m on number 8

Select the correct answer from each drop-down menu. consider the following polynomials equations. 3x^2(x-1) and -3x^3+ 4x^2-2x+1 perform each operation and determine if the result is a polynomial. is the result of a + b a polynomial? yes or no is the result of a - b a polynomial? yes or no is the result of a · b a polynomial? yes or no