Answer:
D
Step-by-step explanation:
First use elimination.
We can eliminate x for this problem.
So we get :
-2y - z = 3
Then, we can multiply the second equation by 3 to eliminate again.
-3x - 3y + 3z = 15
So we get :
-y + 2z = 14
Then, we can multiply equation 4 by 2 to eliminate.
-4y -2z = 6
So we get :
-5y = 20
y = -4
Then, we can plug back in.
4 + 2z = 14
2z = 10
z = 5
x + 4 - 10 = -2
x - 6 = -2
x = 4
(4,-4,5)
