The regression coefficient for beef price tells us that beef consumption will decrease by 12 pounds for a $1 increase in beef price.
A regression coefficient tells us the quantum and direction of change in the dependant variable for a unit change in the independent variable.
The question above deals with multiple regression. The formula for multiple regression is as follows:
Y = a + b₁X₁ + b₂X₂
In the above equation, b₁ and b₂ are regression coefficients.