Question

Find the value of k for which given pair of equations have a unique solution: Kx + 2y = 5 ; 3x + y = 1​

Answer 1

Answer:

Explanation:

kx+2y=5------[1]

3x+y=1---------[2]

Multiplying eq.2 by 2

∴ 6x+2y=2--[3]

Subtracting Eq.3 from 1

∴kx+2y=5

-  6x+2y=2

  (-)  (-)   (-)

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∴k-6=3

∴k=3+6

∴k=9

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