a) 6 If 2x - 3y = 7 and (a + b)x - (a + b - 3) y = 4a + b represent coincident lines, then and b satisfy the equation (a) a +56=0 (b) 5a + b =0 (c) a-5b=0 (d) 5a-b=0 hon the line
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Correct option is
C
a - 5b = 0
2x - 3y = 7 and (a + b)x - (a + b - 3)y = 4a + b represent coincident lines then,
2
a+b
=
3
a+b−3
=
7
4a+b
2
a+b
=
7
4a+b
7(a+b)=2(4a+b)
7a+7b=8a+2b
a−5b=0
Answer (C) a - 5b = 0
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