Question

tell me answer fast ​

Answer 1

here

a1=4 ,b1=k and a2=2 ,b2=1

given that the equations have unique solution

so, a1/a2 is not equal to b1/b2

4/2 is not equal to k/1

then

k is not equal to 4/2

=> k is not equal to 2

hence, the given system of equation will have unique solution when k is not equal to 2.

hope it helps you. ........

Answer 2

it will help you for clear understanding