Introductory Algebra for College Students (7th Edition)

We simplify the expression to: $$15x + 40y$$
To simplify this expression, we use the order of operations. First, we use the distributive property: $$15x + 10y + 6(5y)$$ Next, we do the multiplication: $$15x + 10y + 30y$$ Finally, we combine like terms: $$15x + 40y$$