Applications
Problem 4
Answer 4
Step 1. Define the variables.
x = pounds of oranges
y = pounds of cherries
Step 2. Write an equation.
Since there are two rates, neither can be the slope alone.
Therefore, the equation that describes this situation is: 2x + 3y = 12
Step 3. Substitute 4 for x and solve for y.
Nimitha can buy 
pounds of cherries.