Becky and luke bought the same kind of pencils and erasers . Becky spent $1.45 for 2 pencils and 3 erasers . Luke spent $2.65 for 5 pencils and 1 eraser what is the Cost of 1 eraser ?
Let P = cost of one pencil
Let E = cost of one eraser
2P + 3E = 1.45 ---> multiply by 5 ---> 10P + 15E = 7.25
5P + 1E = 2.65 ---> multiply by -2 ---> -10P - 2E = -5.30
Add down the columns: 13E = 1.95
Divide by 13: E = 0.15