If a,b,c are arithmetic progression then show that the equation `ax+by+c=0` represents a family of concurrent lines and find the point of concurrency.

If non zero numers a,b,c are in harmonic progression, the show that the equation x/a+y/b+1/c=0 represents a family of concurrent lines and find the point of concurrency.

If 3a+2b+4c=0 then show that the equation ax+by+c=0 represents a family of concurrent straight lines and find the point of concurrency.

From Fig., write concurrent lines and their points of concurrence.

From Fig.,write concurrent lines and their points of concurrence.

If a, b, c are in arithmetic progression, then the roots of the equation ax^2-2bx+c=0 are

If a,b and c are in arithmetic progression, then the roots of the equation ax^(2)-2bx+c=0 are