Yamini and Fatima, two students of Class IX of a school, together contributed Rs 100 towards the Prime Minister’s Relief Fund to help the earthquake victims. Write a linear equation which satisfies this data. (You may take their contributions as Rs x and Rs y.) Draw the graph of the same.

Let the contribution by Yamini = ₹x
Let the contribution by Fatima = ₹y
According to question, x + y = 100
⇒ y = 100 – x
For the graph:
Putting x = 0, we have, y = 100 – 0 = 100
Putting x = 10, we have, y = 100 – 10 = 90
Putting x = 20, we have, y = 100 – 20 = 80
Hence, A(0, 100), B(10, 90) and C(20, 80) are the solutions of equation.