Systems and Matrices Test

Your family goes to a restaurant for dinner. There are 6 people in your family. Some order the chicken dinner for $14.80, and some order steak for $17. If the total bill was $91, which system best represents the situation?

• x + y = 91

  14.80x + 17y = 6

• x + y = 91

  14.80x + 17y = 6

• x + y = 6

  14.80x + 17y = 91

• x + y = 6

  14.80y + 17x = 91

What are the dimensions of this matrix?

• 3

• 3x4

• 4x3

• 4

What is a Matrix?

• A method of finding the nᵗʰ value of a series

• A complicated number system

• An equation of over 5 numbers or symbols

• A set of numbers in rows and columns

Find A+B

• 8 10

  8 1

• can't add two together because the rows don't match columns

• 10 30

  0 1

• 12 25

  7 1

How many rows are in a 7 x 3 matrix?

• 10

• 7

• 21

• 3

Multiply the given matrix by 5.

• 20 -15 10

  30 -5 0

• -20 15 -10

  -30 5 0

• -20 15 -10

  30 -5 0

• 20 15 -10

  30 -5 0

The number of columns in a 2x12 matrix is?

• 10

• 24

• 2

• 12

Find B-A

• 
• not possible because rows do not match columns

• 
• 

What must be true in order to ADD two matrices?

• The column of the 1st must equal the row of the 2nd.

• The dimensions must be equal.

• The determinant can't equal 0.

• They must be square.

Perform the indicated operation:

• 
• not possible

• 
•