Question

. If the pair of equations x-y = 1, x+ky= 5 has a unique solution x=2, y=1 then the value of k is
-2
4
-3
3​

Answer 1

Answer:

For thr the unique solution ,

a1/a2 not equal to b1/b2..

so put a1 , b1 and a2 ,b2 then do cross multiplication you get the value of k

Answer 2

Answer:

if the pair of equations