Question

if the equation 4x-y=9 and kx+y=5 have unique solution, then k=

Answer 1

For unique solution a1/a2 should not be equal to b1/b2 ...so 4/k =1/1
if we cross multiply them we get k is equal to 4...
Bt as the question says it is a unique solution so we'll write it as k should bt be equal to 4

Answer 2

For unique solution a1/a2 should not be equal to b1/b2 ...so 4/k =1/1

if we cross multiply them we get k is equal to 4...

Bt as the question says it is a unique solution so we'll write it as k should bt be equal to 4