Sorry about my last post, i put the working out for a differnt question and i dont know how to delete the question. This is the real working out.. Find the equation of the following straight line through (0,-1) and ( 2, -9) -9-1 / 2-0 = -10/2 y=10/2x + c x = 0 y = -1 -1 = -10/2 (0) + c giving c = -1...