College Algebra Word problems (need help asap)

Question

The demand for a product is proportional to the products price. 12,000 items are supplied at a unit price of $4. Write an equation for the supplied quantity of the product as a function of its price.  

Answer 1

This is a direct relation. The form of a direct relation is

y = kx

 

12000 = k(4)

3000 = k            divide both sides by 4

 

y = 3000x