Question

the equation 3x+my=10, 9x=12y=30 have a unique solution then the value of m is

Answer 1

Answer:

unique solution = a1/a2 is not equal to b1/b2

3x +my -10=0 ,9x+12y-30=0

a₁ =3 a₂=9 ,b₁=m ,b₂=12 ,c₁ =-10,c₂ =-30

a₁/a₂≠b₁/b₂

=3/9 ≠m/12  

=12×3 ≠9m ( cross mutlipilcation)

=36 ≠9m

=m≠ -4