A Multiple Regression Model Has the Estimated Form $\hat { y }$

Multiple Choice

A multiple regression model has the estimated form $\hat { y }$ = 7 + 2x₁ + 9x₂

As x₁ increases by 1 unit (holding x₂ constant) , y is expected to

A) increase by 9 units.
B) decrease by 9 units.
C) increase by 2 units.
D) decrease by 2 units.