Question

Find the solution to the system of equations.

2x + 4y + 2z = -8
5y - 2z = 0
4z = -20


A. x = 4, y = -1, z = -5
B. x = -3, y = 2, z = 4
C. x = 5, y = 0, z = 2
D. x = 5, y = -2, z = -5

Answer 1

z= -5
That leaves options a and d
D is the answer. Try substituting all values.