Show that the lines ax + 2y + 1 = 0, bx + 3y + 1 = 0 and cx + 4y + 1 = 0 are

STRAIGHT LINES CHAPTER 9 CLASS 11

QUESTION 16
Show that the lines ax + 2y + 1 = 0, bx + 3y + 1 = 0 and cx + 4y + 1 = 0 are
concurrent if 2b = a + c.
OR
show that a,b,c are in A.P