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Peter and his friends visited the same café in Wonderland four times last week.

1. The first time, they bought 3 cups of coffee, 2 muffins, and 1 bagel, paying 20.50 Wonderlandian dollars.
2. The second time, they bought 2 cups of coffee, 1 tea, 1 muffin, and 1 bagel, costing $16.00.
3. The third time, they had 1 cup of tea and 1 bagel, which was $5.00.
4. The fourth time, they had 1 cup of coffee, 1 muffin, and 1 cup of tea, costing $10.50.

Set up a system of linear equations for this problem, use the Gaussian algorithm to obtain a row echelon form of the augmented matrix, and find the price of each item.

Answer :

Final answer:

To set up a system of linear equations for this problem, assign variables to the prices of the items. Then use the Gaussian algorithm to solve the system and find the price of each item.

Explanation:

To set up a system of linear equations for this problem, we can assign variables to the prices of the items. Let's call the price of a cup of coffee C, the price of a muffin M, the price of a bagel B, and the price of a cup of tea T.

From the information given, we can write the following equations:

  • 3C + 2M + B = 20.50
  • 2C + T + M + B = 16.00
  • T + B = 5.00
  • C + M + T = 10.50

Now let's solve this system of equations using the Gaussian algorithm to get the row echelon form of the augmented matrix:

+-----------------+

| 3 2 1 1 | 20.50

| 2 0 1 1 | 16.00

| 0 1 1 0 | 5.00

| 1 1 1 0 | 10.50

+-----------------+

Solving this augmented matrix yields the row echelon form:

+-----------------+

| 1 0 0 1 | 7.50

| 0 1 0 -1 | 4.00

| 0 0 1 1 | 2.50

| 0 0 0 0 | 0.00

+-----------------+

From the row echelon form, we can conclude that C = 7.50, M = 4.00, B = 2.50, and T = 0.00. Therefore, the price of each item is as follows:

  • Cup of coffee: $7.50
  • Muffin: $4.00
  • Bagel: $2.50
  • Cup of tea: $0.00

Learn more about Linear Equations here:

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Rewritten by : Jeany