MATH QUIZ 7 QUESTIONS

1 of 7 Which of the following systems has (1, -1) as a solution? O 2x + 3y = 1 5x - 3y = -8 O 3x + 2y = 1 5x - 3y = 8 O 3x + 2y = 1 5x + 3y = -8 O 3x - 2y =1 5x + 3y = 82 of 7 From the list of equations: 1.y=x- 3 2. y = 2x - 6 3. 3y = 3x - 9 4. 3y = 3x + 9 Which pair of equations forms a system that has infinitely many solutions? O 1 and 3 O 1 and 4 O 2 and 4 O 1 and 23 of 7 Given the matrices below, 6 3 5 = 7 10 B 6 1 c = 18 8 11. 5 2 if D = A + 0, then the element da is: O 33 6 O 12 O 154 of 7 If A =[76 , find A- 1 . 2 6 OA = 6 ON =5 of 7 Solve the system of equations defined by 2x + 3y = 12 3x + 2y = 13 using matrices. Hint: (3 2] - 13 The value of * is O 2 O -4 0 6 O 360f? Ashley and Stephanie went shopping for Father's Day at the same store. Stephanie spent$105 for 2 t-shirts and 3 pairs of shorts. Ashley bought 3 tshirts and 2 pairs of shorts for $95. What was the cost of a pair of shorts? (Hint: The equation for Ashley's purchases is 3T+2S=95 First determine the equation for Stephanie's purchases and then solve the system of equations using matrices.) O $1? for shorts 0 $25 for shorts 0 $10 for shorts O $15 for shorts 7 of 7 An triangle has vertices A, B, C as shown in the diagram. It has been translated vertically and/or horizontally to the triangle with vertices labelled A', B', and O' using a translation matrix defined as T. B A B' C ' Which of the following matrices is T? OT = - 2 OT = $ 3 2 OT = 2 O T = -5 : -21