CBSE Notes, Lectures

CBSE - Mathematics - Linear Equations in Two Variables

Linear Equations in Two Variables

NCERT Exercise Exercise 4.3

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.

 

Answer

Let the contribution amount by Yamini be x and contribution amount by Fatima be y.
A/q,
x + y = 100
When x = 0 then y = 100
When x = 50 then y = 50
When x = 100 then y = 0
 

x 0 50  100 
        y               100           50            0      

.