Answer: x = 4, y = -6, z = 1
Step-by-step explanation:
EQ2: 4x + 2y + 3z = 7 → 1(4x + 2y + 3z = 7) → 4x + 2y + 3z = 7
EQ3: -2x - y - z = -3 → 2(-2x - y - z = -3) → -4x -2y - 2z = -6
z = 1
EQ1: 3y - 5z = -23
3y - 5(1) = -23
3y - 5 = -23
3y = - 18
y = -6
EQ3: -2x - y - z = -3
-2x - (-6) -(1) = -3
-2x + 6 - 1 = -3
-2x + 5 = -3
-2x = -8
x = 4
