Matrix Elimination

Which row command is an appropriate next step?

• 7R2 + R3 -> R3

• -7R1 + R3 -> R3

• 7R3 -> R3

• -7R2 + R3 -> R3

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 solution to this system?

• <(2, 3, -1)>

• <(3, -1, 2)>

• <( -1, 3, 2)>

• <(2, -1, 3)>

A _____ is a rectangular arrangement of numbers.

• matrix

• dimension

• coefficient

• system

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)

Perform the indicated operation

• 
• 
• 
• 
• not possible

What is the value of y?

• 3

• 7

• -1

• 2

What is the value of x in this system?

• 3

• -1

• 7

• 2

Solve by elimination or substitution

• (5, 3, 3)

• (0, 6, -6)

• (3, 3, 4)

• (4, 6, 3)

Solve by elimination or substitution.

• (-1, -3, 0)

• (6, -1, 4)

• (3, 3, -4)

• (0, 3, -1)