## Algebra 2 (1st Edition)

Like terms must (1) be raised to the same power and (2) consist of the same variable (i.e. x and y are not like terms). It is also important to note that numbers are all like terms with each other when not multiplied by anything. Thus, combining like terms, we obtain: $$=(9-2)j+(4-7)k \\ = 7j-3k$$