What is the domain of the function y= x + 6 - 7

On a piece of paper graph y < 3x

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?