The Total solution for NCERT class 6-12
⇒ –a – 1 = 2(1 + b)
⇒ –a – 1 = 2 + 2b
⇒ a+ 2b = – 3 … (1)
Also, the point (1, 1) lies on the curve xy + ax + by = 2,we have
1 × 1 + a × 1 + b × 1 = 2
⇒ 1+ a + b = 2
⇒ a+ b = 1 … (2)
From (1) & (2), we get b = -4
Substitute b = – 4 in a + b = 1
a – 4 = 1
⇒ a= 5
So the value of a = 5 & b = – 4