Simplify 7(3x = y) i need help im to confused

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

What is the solution of the systems of equations? y=2/3x+3 x=-2

Question: a) does the given set of points represent a linear function? how do you know? b) assume that the point (-2,4) lies on the graph of a line. what y-values could complete this set of ordered pairs that lie on the same line: (- (hint: there are several correct answ