## Introductory Algebra for College Students (7th Edition)

$18y+7$
Commutative properties: $a+b=b+a,\qquad ab=ba$ Associative properties:$a+(b+c)=(a+b)+c,\qquad a(bc)=(ab)c$ Distributive property: $\quad A(x+y)=Ax+Ay$ --- $8y+7+10y=\qquad$ ...commutative property: $7$ and $10y$ can change places $=8y+10y+7=$ ...associative property: we can add any pair we like, first $=(8y+10y)+7$ ... combine like terms, = $18y+7$