## Algebra 1: Common Core (15th Edition)

a. $4xy^{3} + 5x^{3}y$ are simplified completely because the two are not like terms b. -(y-1) still has a negative sign that can be distributed c. 12xy and -3yx are like terms despite the fact that the order of coefficients is different. By the rules of multiplication, 12xy=12yx and -3xy=-3yx