Kruthik8 Years agoWe can find the equation of the line passing through (-1,3) & (4,-2) by ‘2 Points form’, ie y-y1/y2-y1 = x-x1/x2-x1.That is, x + y – 2= 0.As this line passes through point (a,b), x=a & y=b satisfies its eqn.Thus a + b – 2=0Hence a + b = 2.Hope that helped you.