Answer:
4x+3y<=15
Explanation:
Given data
cost of blueberries = $4 per pound
cost of grapes = $3 per pound
total amount at hand =$15
let the number of blueberries be x
cost of x blueberries=4x
let the number of grapes be y
cost of y grapes=3y
therefore the total is
4x+3y<=15