November 12 Quizizz: Matrices & Systems of Equations

In Matrix R (pictured) what element is in the second row, third column?

• 8
• 9.01
• 6
• 1

What are the dimensions of this matrix?

• 2 x 3
• 3 x 2
• 6 x 1
• 1 x 6

Dimensions?

• a
• b
• c
• d

What is a Matrix?

• An equation of over 5 numbers or symbols

• An array of numbers or variables arranged in rows and columns

• A method of finding the n^th value of a series

• A complicated number system that permits you to enter alternate realities

The order (size) of a matrix is written as

• number of rows x number of columns

• number of columns x number of rows

• a multiple

• however you want

Name the dimensions

• 3x1
• 1x3

Subtract (ignore the fact that I couldn't put matrix brackets in the answers)

• 3    -8
  0   -1
• 3   -4
  8  -13
• -3   8
  0    1
• 3   -8
  -8    1

Find A+B

• 8     10
  8      1 
• 12     25
  7     1
• 10     30
  0     1
• can't add two together because the rows dont match columns

What do a, b, c and d equal in this matrix addition?

• a = -1, b = 10, c = 7, d = -11
• a = -1, b = 10, c = -11, d = 7
• a = 10, b = -1, c = 7 , d = -11 
• a = 10, b = -1, c = -11, d = 7

What do w, x, y and z equal in this matrix subtraction?

• w = 13, x = 4, y = 7, z = 23
• w = 13, x = -4, y = 11, z = 23
• w = 13, x = 4, y = 11, z = 23
• w = 13, x = 4, y = 11, z = 17