by 11. = a +b, ax - by = 2ab. [CBSE 2007C] ax b

Area of the rhombus formed by the lines ax +- by +- c = 0 is (A) 2c^2/|ab| (B) |ab|/2c^2 (C) c^2/|ab| (D) |ab|/c^2

(ax)/b-(by)/a=a+b , ax-by=2ab

(ax)/(b)-(by)/(a)=a+b,ax-by=2ab

Show that the lines ax+by+c=0, ax-by+c=0, ax-by=c ax+ by-c=0 (a ne b) enclose a rhombus whose area is (2c^(2))/(ab) sq unit.

IF ax^2 + 2cx + b=0 and ax^2 + 2bx +c=0 ( b ne 0) have a common root , then b+c=

If ax+by+c=0 " and " a'x+b'y+c'=0 , then prove that x/(bc'-b'c)=y/(ca'-c'a)=1/(ab'-a'b)

Prove that |(a,b,ax+by),(b,c,bx+cy),(ax+by, bx + cy, 0)| = (b^(2)-ac)(ax^(2) + 2bxy + cy^(2)) .