For which value(s) of a does the curve y=x tax +2 have a horizontal tangent line at x =1 ? Show your work. Do not use any differentiation rules!For each statement, explain why it must be true, or use an example to show that it can be false. - If y=f[a:) has a horizontal tangent line at 2121 then y=g(a:) . where g(a:) =f[a: 1)+1 , has a horizontal tangent line at 9: =2 . . A tangent line always has exactly one point in common with the graph of the function