Solve the problem.
-At a local grocery store the demand for ground beef is approximately 50 pounds per week when the price per pound is $4,but is only 40 pounds per week when the price rises to $5.50 per pound.Assuming a linear relationship between the demand x and the price per pound p,express the price as a function of demand.Use this model to predict the demand if the price rises to $5.80 per pound.
A)p = - 0.15x - 11.5; 40 pounds
B)p = - 0.15x + 11.5; 38 pounds
C)p = 11.5x + -0.15; 40 pounds
D)p = 0.15x + 11.5; 38 pounds

Question

Quizplus · Accepted Answer

The slope of the line is calculated as (5.50 - 4) / (40 - 50) = 0.15. Using the point-slope form, the equation is p = -0.15x + 11.5. Substituting p = 5.80, we solve for x to find the demand is 38 pounds.

Solve the Problem. -At a Local Grocery Store the Demand for Ground Beef