Question

If the points A(0,a), B(0,,b) and C(1,1) are collinear prove that 1/a + 1/b = 1

Answer 1

a+b/2=1=>a+b=2=>a=2-b 1/2-b+1/b=b+2-b /b(2-b)=2/2=1 (proved)