alexandraigoe7187 alexandraigoe7187

06-10-2017
Mathematics

contestada

Which ordered triple is a solution of this system?

2x + y - z = 7
-x - 2y + 4z = -15
x + 2y - 5z = 17

a) (3, 1, 0)
b) (1, 3, -2)
c) (2, 5, 2)
d) (-2, 6, -5)

Respuesta :

sqdancefan sqdancefan

11-09-2019

Answer:

b) (1, 3, -2)

Step-by-step explanation:

A suitable calculator can give you the answer to this right away. Or, you can try the answer choices in the equations to see which works.

The answer choice that works is choice B.

2·1 +3 -(-2) = 7

-1 -2(3) +4(-2) = -15

1 +2(3) -5(-2) = 17

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