Question

If a + b = 1 , then the points of intersection of the lines ax + by = 1 , bx + ay = 1 is A) (a, b) () (1,1) B) (b. a) c)(1,1) D) None​

Answer 1

Answer:

If you add the 2 equations you will get (a+b) x+(a+b) y=2

X+Y=2 (since a+b=1)

Now choose from the options substitute in place of x and y the given answers.

C) 1+1=2 it's true

So answer is option C