In the first-order model $\hat{y}$ = 60 + 40x₁ -10x₂ + 5x₁x₂, a unit increase in x₁, while holding x₂ constant at 1, increases the value of $y$ on average by 45 units.

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The Answer of In the first-order model $\hat{y}$ = 60 + 40x₁ -10x₂ + 5x₁x₂, a unit increase in x₁, while holding x₂ constant at 1, increases the value of $y$ on average by 45 units.

In the First-Order Model y^\hat{y}y^​ = 60 + 40x1 -10x2 + 5x1x2, a Unit Increase

In the First-Order Model $\hat{y}$ = 60 + 40x₁ -10x₂ + 5x₁x₂, a Unit Increase