Question 757552
Notebook = x
Pencil = y
3x + 4y = 8.50........1
5x + 8y = 14.50.......2
Multiply (1) by 2
6x + 8y = 17.00.......3
5x + 8y = 14.50.......2
Subtract (2) from (3)
 x      =  2.50
Substitute x = 2.50 in Eq(1)
  3x + 4y = 8.50
7.50 + 4y = 8.50
       4y = 8.50 - 7.50
       4y = 1.00
        y = 0.25
Notebook costs $2.50
Pencil costs   $0.25
Hope this helps.
:-)