Number of slices of bread in a stack that is 1 foot high

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?

The sum of two numbers is 86, and their difference is 20. find the two numbers

Graph the equation. select integers for x