Gaussian Elimination Exam Questions

A _____ is a rectangular arrangement of numbers.

• matrix
• dimension
• coefficient
• system

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

• augmented matrix
• constant matrix
• linear matrix
• coefficient matrix

When an element is missing in an equation, what value must go into the matrix for it?

• 1

• -1

• 0

• NA

Which row command is an appropriate next step?

• 7R2 + R3 -> R3

• -7R1 + R3 -> R3

• 7R3 -> R3

• -7R2 + R3 -> R3

What is the value of z?

• 6

• -6

• -36

• 4

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

What is the value of y?

• 3

• 7

• -1

• 2

What is the value of x in this system?

• 3

• -1

• 7

• 2

What is the solution to this system?

• {(2, 3, -1)}

• {(3, -1, 2)}

• {(-1, 3, 2)}

• {(2, -1, 3)}