Question

total marks obtained by two students for 40 in a class test Express it as a linear equation in two variables and draw its graph

Answer 1

let,
one student is x
other student is y
the equation is
x+y=40
hope it helps you

Answer 2

let the marks obtained by 1st student=x
let the marks obtained by 2nd student=y

ATQ

x+y=40
y=40-x

i) if x=10
then,y=40-( 10)
then y=30

ii)if x=20
then,y=40-( 20)
then y=20

iii)if x=30
then,y=40-( 30)
then y=10