Inverse of a Matrix & Solving a System of 2 Equations

Which matrix is an identity matrix

• A

• B

• C

• D

Tags

CCSS.HSN.VM.C.10

What is the inverse of this matrix?

• _{(1/25)  (-4/25)
  (3/25)  (13/25)}
• _{(1/5)  (-4/5)
  (3/5)  (13/5)}
• _{(6/25)  (-2/25)
  (2/25)  (9/25)}
• _{(1/150)  (-4/150)
  (3/150)  (13/150)}

Tags

CCSS.HSA.REI.C.9

Which of the following matrices do NOT have an inverse?

• [1 2]

  [3 4]

• [6 0]

  [4 2]

• ⌈6 3⌉

  ⌊4 2⌋

Which of the following is the inverse of the matrix A=

⌈3 0⌉

⌊0 2⌋

• [1/2 0]

  [0 1/3]

• [-3 0]

  [0 -2]

• ⌈1/3 0⌉

  ⌊0 1/2⌋

• [2 0]

  [0 3]

Which matrix has an undefined inverse?

(Hint: undefined matrices have determinants of 0)

• [1 2]

  [0 3]

• [1/2 3/4]

  [4/2 9/3]

Are A and B inverses?

A = ⌈3 -10⌉

⌊1 4⌋

B = ⌈2/11 5/11⌉

⌊-1/22 3/22⌋

(Hint: A*B=I)

• Yes

• No

• x=2
  y=-1
• x=-1
  y=2
• x=-2
  y=1
• x=1
  y=-2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is A^-1?

• 
• 
• 
• 

Tags

CCSS.HSA.REI.C.9

• A

• B

• C

• D

Tags

CCSS.HSA.REI.C.8

• A

• B

• C

• D

Tags

CCSS.HSA.REI.C.8