practice test 227

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Algebra 2
Practice Quiz 227

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State the order of each matrix.

1. 1 X 4 1 X 1 4 X 1	2. 3 X 2 2 X 3 3 X 1
Perform the matrix operations.	Find the values of x and y.
3. ^{^⁼} there are no solutions	4. x = 6 & y = 2 x = 2 & y = 6 there are no solutions

Solve each linear system.
5. 3x - 4y = 2 -x + 3y = 1 (1,2) (2,1) (2,2)	6. 4x - 3y = 2 5x + 2y = -1 (-14/23,1/23) (1/23,-14,23) (1/23,14/23)
7. y = 3x - 6 x = 5 (9,5) (5,5) (5,9)
Solve the linear system using Cramer's Rule.
8. 2x - 3y = -17 3x + 4y = 0 (-4,3) (3,-4) (4,3)

Answer.
9. Is (4,-2) a solution for the given linear system? 2x - y = 6 -x + 3y = 14 maybe yes no	10. How can $12,600 be split between two investments if one pays 6% annually and the other 8% annually so the amounts of interest from the two investments are equal? $7200 , $5400 $3600 , $9000 $7000 , $5600

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