Answer
$ŷ=7.965-0.1035x_1+0.936x_2+0.1152x_3$
Work Step by Step
In MINITAB, enter the $x_1$ values in C1, the $x_2$ values in C2, the $x_3$ values in C3 and the $y$ values in C4.
Select Stats -> Regression -> Regression -> Fit Regression Model
Enter C4 in "Responses" and C1 C2 C3 in "Continuous Predictors"
The least-squares regression line will be shown in "Regression Equation", where C4 is $ŷ$, C1 is $x_1$, C2 is $x_2$ and C3 is $x_3$
$ŷ=7.965-0.1035x_1+0.936x_2+0.1152x_3$
