Chapter 4 - Section 4.2 - Assess Your Understanding - Vocabulary and Skill Building - Page 215: 9f

$Σresidual^2=3$ (Other answers are possible depending on the initial points chosen.)

Since $ŷ =2x+1$ $Σresidual^2=Σ(y_i-ŷ _i)^2=Σ[y_i-(2x_i+1)]^2=Σ(y_i-2x_i-1)^2$ $Σresidual^2=(-4-2\times(-2)-1)^2+(0-2\times(-1)-1)^2+(1-2\times0-1)^2+(4-2\times1-1)^2+(5-2\times2-1)^2$ $Σresidual^2=3$