Question 354584: Hi,
Could you please help me with the following problems. I don't understand them. Thanks.
1. Select the set of equations that represents the following situation: The cost of six CDs and twelve DVDs is $73.26; and the cost of thirteen DVDs and twelve CDs is $140.11. How much do a CD and a DVD cost?
6x + 12y = 73.26; 13x + 12y = 140.11
6x · 12y = 73.26; 12x · 13y = 140.11
6x · 12y = 73.26; 13x · 12y = 140.11
6x + 12y = 73.26; 12x + 13y = 140.11
2. Select the set of equations that represents the following situation: Mary invested one amount at 7% simple interest, and a second amount at 5% interest, earning $29.80 in one year. If she had switched the amounts, she would have earned $35.00. What were the two amounts?
0.07x + 0.05y = 29.80; 0.07y + 0.05x = 35.00
7x + 5y = 29.80; 7y + 5x = 35.00
0.07x + 0.05y = 35.00; 0.07x + 0.05y = 29.80
7x + 5y = 35.00; 7x + 5y = 29.80
3. To buy both a new car and a new house, Tina sought two loans totalling $191,610. The simple interest rate on the first loan was 6.3%, while the simple interest rate on the second loan was 8.8%. At the end of the first year, Tina paid a combined interest payment of $16,681.66. What were the amounts of the two loans?
4. A dehydrated patient needs a 6.1% saline IV. Unfortunately, the hospital only has bags of 5% and 7% saline solutions. How many liters of each of these solutions should be mixed together to yield 2 liters of the desired concentration?
5. Solve using the elimination method. Show your work. If the system has no solution or an infinite number of solutions, state this.
5x – 4y = 10.5
20x – 16y = 42
Answer by work123(1)   (Show Source):
You can put this solution on YOUR website! Your cheating. I had to do the exact same test with the exact same answers. Try learning the math and working it out yourself. Your conscience is screaming cheater and you know it.
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