For this, combine like terms. In this case, the like terms are 3x-2x, 2y+3y, and (-5). Combine them, and your answer will be 
Answer:
12,800 mL
Step-by-step explanation:
1 L = 1,000 mL
12.8 L × 1,000 mL = 12,800 mL
or
Move the decimal place 3 places to the right to get the same answer
(3x + 2x = 2400)
(5x = 2400)
(x = 480)
(480 were sold for each)
38b + 61t = 791.50....multiply by 27
54b + 50t = 923.....multiply by -19
-------------------
1026b + 1647t = 21370.5 (result of multiplying by 27)
-1026b - 950t = - 17537 (result of multiplying by -19)
------------------add
697t = 3833.50
t = 3833.50 / 697
t = 5.50 <=== cost of each towel
38b + 61t = 791.50
38b + 61(5.50) = 791.50
38b + 335.50 = 791.50
38b = 791.50 - 335.50
38b = 456
b = 456/38
b = 12 <== cost of each bed sheet
so the cost of 1 towel and 1 bed sheet is : 12 + 5.50 = 17.50
