solve a system with matrix inverses or augmented matrices
Grade 11 Math Worksheet - Challenge Me
Circle the best answer, or write your answer on the line.
[1, 3, -2 | 5; 2, -1, 4 | 9; -3, 2, 1 | 7]. Luz replaces row 2 of the table in the figure with row 2 − 2 × row 1. What is the new number in row 2, in column 3?
[1, -1, 2 | 6; 2, 3, -1 | 1; 4, 2, 5 | -3]. Milo replaces row 3 of the table in the figure with row 3 − 4 × row 1. What is the new number in row 3, after the bar?
[2, 1, 3 | 6; 0, 1, -2 | 4; 0, 3, 2 | -5]. Noah replaces row 3 of the table in the figure with row 3 − 3 × row 2. What is the new number in row 3, after the bar?
Adult volunteers sold 200 school-play tickets for $1,160: student tickets at $4 and adult tickets at $7. Zee uses X = A⁻¹B. How many student tickets were sold?
Esme mixes 12 cups of green paint from x cups of yellow and y cups of blue, with twice as much yellow as blue. Using X = A⁻¹B, how many cups are blue?
Jun lays 30 tiles covering 66 square inches: x square tiles of 4 square inches and y triangle tiles of 1 square inch. Using X = A⁻¹B, how many square tiles?
The cooking club spends $26 of club funds on 9 bags: rice at $2 a bag and beans at $4 a bag. Using X = A⁻¹B, how many bags of rice does Kira buy?
Read this first
System
3x + 2y = 2; 2x + 2y + z = 4; -x − y − z = -5. Number table A = [3, 2, 0; 2, 2, 1; -1, -1, -1], B = [2; 4; -5].
Luz's calculator gives A⁻¹ = [1, -2, -2; -1, 3, 3; 0, -1, -2] for the system in the figure. What is z?
System
2x + z = 14; 3x + y + z = 15; -x − z = -10. Number table A = [2, 0, 1; 3, 1, 1; -1, 0, -1], B = [14; 15; -10].
Noah's calculator gives A⁻¹ = [1, 0, 1; -2, 1, -1; -1, 0, -2] for the system in the figure. What is z?
System
-x + 2y + 2z = 3; x − y = -2; -x + y − z = 4. Number table A = [-1, 2, 2; 1, -1, 0; -1, 1, -1], B = [3; -2; 4].
Pia's calculator gives A⁻¹ = [1, 4, 2; 1, 3, 2; 0, -1, -1] for the system in the figure. What is y?