Understanding Augmented Matrices and Interest Calculations

This video tutorial demonstrates solving a system of equations using an augmented matrix and a TI-84 calculator. It covers defining variables, setting up equations, creating an augmented matrix, and using the calculator to find row echelon forms. The video concludes with interpreting the results to determine the amounts invested in two accounts with different interest rates.

What is the primary tool used in this video to solve the system of equations?

• TI-84 Graphing Calculator

• Microsoft Excel

• Python Programming

• Manual Calculations

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What does the variable 'x' represent in the investment problem?

• The total amount invested

• The amount invested at 2.8% interest

• The amount invested at 6.5% interest

• The total interest earned

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CCSS.8.EE.C.8C

What is the total amount of money invested in the two accounts?

• $20,000

• $985.50

• $11,500

• $8,500

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How is 2.8% of x expressed in decimal form?

• 2.8x

• 0.028x

• 28x

• 0.28x

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What is the first step in entering the augmented matrix into the TI-84 calculator?

• Pressing the 'Graph' button

• Calculating the determinant

• Entering the matrix dimensions

• Selecting the 'Mode' button

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What does the first row of the row echelon form represent?

• y = 11,500

• x = 8,500

• x + y = 20,000

• x + y = 11,500

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CCSS.8.EE.C.8B

In reduced row echelon form, what is the value of x?

• 8,500

• 985.50

• 20,000

• 11,500

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CCSS.8.EE.C.8B

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What additional step is required when using row echelon form to find x?

• Dividing y by 6.5%

• Adding y to 20,000

• Subtracting y from 20,000

• Multiplying y by 2.8%

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How much was invested at 6.5% interest according to the solution?

• $20,000

• $8,500

• $11,500

• $985.50

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What is the advantage of using reduced row echelon form over row echelon form?

• It requires more calculations

• It provides the solution directly

• It is easier to enter into the calculator

• It uses fewer matrix operations

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CCSS.8.EE.C.8B

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