Question 802970
Large pies = x
Small pies = y
40x + 40y = 154........1
30x + 50y = 144.5.......2
Multiply Eq(1) by 3
Multiply Eq(2) by 4
120x + 120y = 462.......3
120x + 200y = 578.......4
Subtract Eq(3) from Eq(4)
        80y = 116
          y = 116/80
          y = 1.45
Substitute y = 1.45 into
Eq.(1).
40x + 40y = 154
40x + 58  = 154
40x       = 154 - 58
40x       = 96
  x       = 96/40
  x       = 2.40
Large pies cost $2.40
Small pies cost $1.45
Hope this helps.
:-)