Find the value of k for which each of the following systems of equations has no solution:
kx + 3y = k - 3,12x + ky = k.
Given: kx + 3y = k - 3 – eq 1
12x + ky = k – eq 2
Here,
a1 = k, b1 = 3, c1 = - (k - 3)
a2 = 12, b2 = k, c2 = - k
Here,
Given that system of equations has no solution
∴ =
≠
=
≠
Here,
=
k×k = 3×12
k2 = √36
K = ±6 eq 3
Also,
≠
3× - k - (k - 3)× k
- 3k ≠ - k2 + 3k
K2 - 3k - 3k≠ 0
K26k≠ 0
K(k - 6) ≠0
K ≠ 0 and k ≠ 6 eq 4
From eq 3 and
eq 4 we can conclude
K = 6
∴ k = - 6