Question

The cost of coffee is determined by the type of coffee beans that are mixed together. The cost of a local mix of Arabica and Robusta beans is modeled by the equation below, where A = the pounds of Arabica and R = pounds of Robusta:

700A + 1200R = 1,000,000

If a mixture contains 1000 pounds of Arabica beans, how many pounds of Robusta beans should be in the mixture?
R = ________________ pounds

Answer 1

700A + 1200R = 1,000,000 :This equation says that for every point of Arabica its 700 dollars and 1200 dollars for a pound of Robusta

he says there is some mixture of the pounds of Arabica and Robusta such taht the total is 1,000,000

And Also
A+R=1000 : A is the number of pounds of arabica and R is the number of pounds of robusta

Answer 2

700A + 1200R = 1,000,000
A+R=1000
We must solve for R from these 2 equations