Question

What is the solution to the system of equations?

-x-y-2z=-2

-x-y+z=5

3x+2y-z=-1

a.(4, –4, –5)
b.(4, –4, 5)
c.(4, 4, 5)
d.(–4, –4, 5)

Answer 1

\[\left\{x=\frac{20}{3},y=-\frac{28}{3},z=\frac{7}{3}\right\} \]

Answer 2

Thank you but Im not sure what to do from here

Answer 3

@robtobey

Answer 4

a.(4, –4, –5)
b.(4, –4, 5)
c.(4, 4, 5)
d.(–4, –4, 5)
All are incorrect answers.

From Mathematica:\[\{-x-y-2 z= -2\}\text{/.}\{ x\to 4,y\to -4,z\to 5\} \to \{\text{False}\}\]

Answer 5

The fractions I posted are the correct answers.

Answer 6

ok thank you but Those Are the only answers I have.

Answer 7

all are incorrect

Answer 8

sorry for the first one its x - y - 2z = -2

Answer 9

@rkreddy1986

Answer 10

With the change, x - y - 2z = -2, \[\{x=4,y=-4,z=5\} \] are correct.

Answer 11

Thank you