Matrices and Determinants 4 Question 9

9. If the system of linear equations

2x+2y+3z=a3xy+5z=bx3y+2z=c

where a,b,c are non-zero real numbers, has more than one solution, then

(2019 Main, 11 Jan I)

(a) bca=0

(b) a+b+c=0

(c) bc+a=0

(d) b+ca=0

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Answer:

Correct Answer: 9. (a)

Solution:

  1. We know that, if the system of equations

a1x+b1y+c1z=d1a2x+b2y+c2z=d2a3x+b3y+c3z=d3

has more than one solution, then D=0 and D1=D2=D3=0. In the given problem,

D1=0|a23b15c32|=0a(2+15)2(2b5c)+3(3b+c)=013a4b+10c9b+3c=013a13b+13c=0ab+c=0bac=0



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