4x-3y-6z=0 (1)x+2y-7z=0 (2)4(2)-(1)11y-22z=0y:z = 2:1=> y=2k and z=k (3)sub (3) into (1)4x-6k-6k=0x=3k(x,y,z) = (3k,2k, k)
