Kavita and Kavia, two students of ClasS IX of a school, together contributed Rs 100 towards Prime Minister's found to help flood victims. Write a linear equatoins, which satisfies this data and draw the graph of the same.

Yamini and Fatima, two students of Class IX of a school, together contributed ₹ 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 ₹ x and ₹ y.) Draw the graph of the same.

Rajesh and Kunal, two students of class, together contributed Rs 100 for old age home to help old people left by their children. Write a linear eqution, which satisfies the data.

Two hundred students of 6th and 7th classes were asked to name their favourite colour so as to decide upon what should be the colour of their school building. The results are shown in the following table. Represent the given data on a bar graph. Answer the following questions with the help of the bar graph: Which is the most preferred colour and which is the least preferred?