each rule represent a function or not.write F if its function write N if its not
[tex]1.)y = 3x + 9 \\ 2.)y = - 2x - 7 \\ 3.)x + y = 10 \\ 4.)x { }^{2} + y = 2 \\ 5.)2x {}^{2} + y { }^{2} = 8[/tex]
plss help me :<​