Given lines are: 2x - y = 1 ...(i) x + 2y = 3 ...(ii) Adding 2 × (i) to (ii) ⇒ 5x = 5 ⇒ x = 1 Putting value of x in (i) 2(1) - y = 1 ⇒ y = 1 The intersection is (1, 1) So line has the slope -2 and passes through (1, 1) ∴ Equation of the perpendicular line is (y−y1)=m(x−x1) ⇒y−1=−2(x−1) ⇒y+2x−3=0