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Hi there! Have questions about your homework? At Brainly, there are 60 million students who want to help each other learn. Questions are usually answered in less than 10 minutes. Try it for yourself by posting a question! :D

Δ Given that a straight line ax+by+c = 0 is always passe through the point (1,-2) hence the value of x = 1 and y =-2 therefore from Eqn , a(1)+b(-2)+c = 0 ⇒ a-2b+c = 0 ⇒a+c = 2b so, b= (a+c)/2 therefore a, b ,c are in A.P