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If none of two lines among the following three lines

ax + by -(a + b) = 0

bx - (a + b)y + a = 0

and (a + b)x - ay - b = 0

are parallel then the lines 

(A) are concurrent

(B) from a right-angled triangle

(C) form an equilateral triangle

(D) form a triangle with circumcentre(a + b,a + b)

1 Answer

+1 vote
by (53.8k points)
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Best answer

Correct option  (A)  are concurrent

Explanation :

By adding C1 and C2 to C3, we get

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