Find the value of k for which each of the following systems of equations has no solution:
kx + 3y = 3,12x + ky = 6.
Given: kx + 3y = 3 – eq 1
12x + ky = 6 – eq 2
Here,
a1 = k, b1 = 3, c1 = - 3
a2 = 12, b2 = k, c2 = - 6
Here,
Given that system of equations has no solution
∴ =
≠
=
≠
Here,
=
k×k = 3×12
k2 = √36
K = ±6 eq 3
Also,
≠
3× - 6 ≠ - 3× k
- 18 ≠ - 3k
3k≠18
K≠6 eq 4
From eq 3 and
eq 4 we can conclude
K = 6
∴ k = - 6