If the line x+y-1 = 0 passes through the circumcentre and the point B of a triangle ABC, where ∠B = 90∘. Then the other two vertices (apart from B) of the triangle can lie on the line
x –y +1= 0
Given that the triangle is a right angled triangle. The circumcentre of the triangle is the midpoint of the hypotenuse. So given that the line x+y-1 = 0 passes through the circumcentre, so the other two vertices apart from B lie on a line perpendicular to given line with slope 1.