Question

Brown rice costs $2 per pound and beans cost $1.60 per pound. Lin has $10 to spend on these items to make a large meal of beans and rice for a potluck dinner. Let b be the number of pounds of beans Lin buys and r be the number of pounds of rice she buys when she spends all her money on this meal.

-Write and equation relating the two variables.
-Rearrange the equation so b is the independent variable.
-Rearrange the equation so r is the independent variable.

Answer 1

1(r) represents the number of pounds of rice , the total cost of the rice bought should be 2r.
(b) represents the number of pounds of beans , the total cost of the bean bought should be 1.6b.

We now know she spent $10 on this meal therefore
2r +1.6b=10