c = coat
d = dress
c = (d + 15)
d = d
2 coats = 2(d + 15)
4 dresses = 4d
2(d + 15) + 4d = 150
Find d
2(d + 15) + 4d = 150
2d + 30 + 4d = 150
2d + 4d + 30 = 150
6d + 30 = 150
6d = 150 - 30
6d / 6 = 120 / 6
d = 20
Substitute 20 for d in d + 15 to find c
d + 15
20 + 15
35
c = 35
coat = $35.00
dress = $20.00
