SOLUTION: Set up and solve the system of linear equations using matrices. Safetymax.com sells first aid and emergency preparedness supplies to businesses. A company that assembles first

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Question 1030008: Set up and solve the system of linear equations using matrices.
Safetymax.com sells first aid and emergency preparedness supplies to businesses. A company that assembles first aid kits for consumers purchases 2900 1-inch by 3-inch plastic adhesive bandages, 1440 alcohol wipes, and 160 tubes of antibiotic ointment from Safetymax.com.
The company assembles compact, standard, and deluxe first aid kits for sale to consumers. A compact first aid kit contains 20 plastic adhesive bandages, 8 alcohol wipes, and 1 tube of antibiotic ointment. A standard first aid kit contains 40 plastic adhesive bandages, 20 alcohol wipes, and 2 tubes of antibiotic ointment. A deluxe first aid kit contains 50 plastic adhesive bandages, 28 alcohol wipes, and 4 tubes of antibiotic ointment.
How many of each type of kit should the company assemble to use up all of the bandages, wipes, and antibiotics ordered?



compact _____
standard _____
deluxe _____

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Let A be the number of compact kits, B standard kits, C deluxe kits.
,
,
A(20,8,1)+B(40,20,2)+C(50,28,4)=(2900,1440,160)
,
,
20A%2B40B%2B50C=2900
1.2A%2B4B%2B5C=290
.
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8A%2B20B%2B28C=1440
2.2A%2B5B%2B7C=360
.
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3.A%2B2B%2B4C=160
In matrix form,

.
.
.
Using Cramer's rule,
X=%28matrix%283%2C3%2C%0D%0A2%2C4%2C5%2C%0D%0A2%2C5%2C7%2C%0D%0A1%2C2%2C4%29%29
abs%28X%29=3
.
.
X%5BA%5D=%28matrix%283%2C3%2C%0D%0A290%2C4%2C5%2C%0D%0A360%2C5%2C7%2C%0D%0A160%2C2%2C4%29%29
abs%28X%5BA%5D%29=60
.
.
X%5BB%5D=%28matrix%283%2C3%2C%0D%0A2%2C290%2C5%2C%0D%0A2%2C360%2C7%2C%0D%0A1%2C160%2C4%29%29
abs%28X%5BB%5D%29=150
.
.
X%5BC%5D=%28matrix%283%2C3%2C%0D%0A2%2C4%2C290%2C%0D%0A2%2C5%2C360%2C%0D%0A1%2C2%2C160%29%29
abs%28X%5BC%5D%29=30
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A=abs%28X%5BA%5D%29%2Fabs%28A%29=60%2F3=20
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B=abs%28X%5BB%5D%29%2Fabs%28A%29=150%2F3=50
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C=abs%28X%5BC%5D%29%2Fabs%28A%29=30%2F3=10
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