Chapter 4 - Quadratic Functions and Equations - 4-2 Standard Form of a Quadratic Function - Practice and Problem-Solving Exercises - Page 208: 57

$y = 0.25$

First, we use distributive property: $0.6y + 1.2 - 0.4 + 0.2y = 1$ Combine like terms: $0.8y + 0.8 = 1$ Subtract $0.8$ from each side of the equation: $0.8y = 0.2$ Divide both sides of the equation by $0.8$: $y = 0.25$