System of Linear Equations Using Matrix on Calculator

Which matrix represents 3x + 8y =57, 5x + 4y = 39?

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Which linear system does this represent?

• 4x -2y = 20, -5x - 5y = -10

• 4x -2y = 20, -5x - 5y = 10

• 4x - 5y = 20, -2x - 5y = -10

• -2x + 4y = 20, -5x - 5y = -10

A matrix derived from a system of linear equations is the _____ _____ of the system.

• augmented matrix

• constant matrix

• linear matrix

• coefficient matrix

What is an appropriate first row command to solve this by Gaussian Elimination?

• 2R2 + R2 -> R2

• -2R1 + R2 -> R2

• R3 +R2 --> R3

• 2R1 + R2 --> R2

Two linear equations with the same set of variables

• system of equations

• function

• association

• correlation

Solve the system.  Write the matrix equation on your own paper.
5x + 8y = -12
3x + 5y = -7

• (1, -10)

• No solution

• (-4, 1)

• (1, 10)

Solve:
-4x - 5y - z = 18
-2x - 5y - 2z = 12
-2x + 5y + 2z = 4

• (4, 0, -2)

• (-4, 0, -2)

• Many Solutions

• I did not get any of the answers above so I am assuming none of the above.

What is the value of y?

• 3

• 7

• -1

• 2

Given the matrix below, which numbers do we want to make 1s?
5x + 2y = -1
3x + 7y = 11

• 5 and 3

• 5 and 11

• 5 and 7

• 5 and -1

What will be the matrix size for this system?

• 3x3

• 3x3

• 4x3

• 3x4