Problem

Determine if $(3,-6,2)$ is a solution of the system. \[ \begin{aligned} x+y+z & =-1 \\ x-2 y-z & =13 \\ 2 x-y-2 z & =8 \end{aligned} \] Choose the correct answer below. The ordered triple is not a solution to the system. The ordered triple is a solution to the system.

Solution

Step 1 :Substitute the values of the ordered triple $(3,-6,2)$ into the system of equations.

Step 2 :For the first equation, we have $3 + (-6) + 2 = -1$, which is true.

Step 3 :For the second equation, we have $3 - 2*(-6) - 2 = 13$, which is also true.

Step 4 :For the third equation, we have $2*3 - (-6) - 2*2 = 8$, which is true as well.

Step 5 :Since all three equations are true when we substitute the values of the ordered triple $(3,-6,2)$, this means that the ordered triple is a solution to the system.

Step 6 :\(\boxed{\text{The ordered triple is a solution to the system.}}\)

From Solvely APP
Source: https://solvelyapp.com/problems/26756/

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