Question

x-2y=3;3x+ky=1.for unique solutions

Answer 1

x – 2y – 3 = 0 
=3x + ky – 1 = 0
=a1 = 1, b1 = -2, c1 = -3
=a2 = 3, b2 = k, c2 = -1

Answer 2

x-2y-3=0
3x+ky-1=0
here
1\3=-2/k
k=-6