B) x = 2, y = 3, z = 5
Step-by-step explanation:
3x β2y + 4z = 20
3(2) - 2(3) + 4(5) = 20
20 = 20
βx + 5y +12z = 73
-2 + 5(3) + 12(5) = 73
73 = 73
x + 3y β2z = 1
2 + 3(3) - 2(5) = 1
1 = 1