Of the $24, she has $10 left, therefore, she spent $14 on the 7 pencils. You can tell now how much each pencil cost, since 7 goes into 14, 2 times.The answer is the cost for each pencil= $2. However, in order to represent the problem using equations:Assign a variable for the cost of each pencil, let x represent the cost$24 equals 7 pencils, each x dollars worth, and the $10 left over: 24=7x+10.Solve for x, 24-10=7x14=7x$2=xThe cost of each pencil is $2.