camosloppy7677

07.03.2020 • 

Mathematics

A and B are n×n matrices. Mark each statement True or False. Justify your answer.

a. A row replacement operation does not affect the determinant of a matrix.

b. The determinant of A is the product of the pivots in any echelon form U of A, multiplied by (−1)r, where r is the number of row interchanges made during row reduction from A to U.

c. If the columns of A are linearly dependent, then det A=0. d. det (A+B)=det A+det B.

Ответ:

hazle9586

11.02.2020

Mathematics

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  y = -x +5

Step-by-step explanation:

The 2-point form of the equation of a line is useful for this.

  y = (y2 -y1)/(x2 -x1)(x -x1) + y1 . . . 2-point form of equation for a line

  y = (-2 -6)/(7 -(-1))/(x -(-1)) +6 . . . . substitute the give points

  y = -8/8(x +1) +6 . . . . . . . . . . . . . . simplify a bit; next, simplify more

  y = -x +5

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