Question

find the solution to the system of equations

3x+3y+3z=18
x+3y+3z=10
x-3y-4z=0

a. x=5, y=3, z=3
b.x=4, y=4, z=-2
c.x=-2, y=4, z=4
d. x=5, y=3, z=9

Answer 1

answer to the question: b