6. If the solution of Ax6 contains two free varlables, a, the zeros of A lie on a line b. the zeros of A lie on a plane c. none of the above 7. The vectors and 6 a. are independent b. are dependent 8. A rotation matrix in R has a. always real eigenvalues b. always complex eigenvalues C. none of the above 2x10y = 23 9. The system 4x +20v =15 has a unique solution a. b. has no solution c. has infinitely many solutions 10. The graph of a linear equation in 3 variables is a. a plane in 3 dimensionis b. a hyperplane in 3 dimensions C. hone of the above

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