9th Maths 4.1

NCERT Class 9th solution of Exercise 4.2

NCERT Class 9th solution of Exercise 4.3

NCERT Class 9th solution of Exercise 4.4

NCERT Class 9th solution of Exercise 3.1

Exercise 4.1

Q1. The cost of a notebook is twice of a pen. Write a linear equation to represent the statement.
Sol. :
Let the cost of the pen is ₹ x
and The cost of the notebook is ₹ y.
So, that the required equation is y-2x=0ory=2x
Answer :
y-2x.
Q2.Express the following linear equation in the form of ax+by+c=0 and indicate the value of a,b, and c in each case :
i) 2x+3y=9.3ˉ5 ii) x-y5-10=0  iii) -2x+3y=6  
iv) x=3y  v) 2x=-5y  vi) 3x+2=0  vii) y-2=0  
viii) 5=2x
Sol. :
i)  2x+3y=9.3ˉ5
Answer :
Linea equation in the form of ax+by+c=0
  2x+3y-9.3ˉ5=0 
where a=2,b=3 and c=-9.3ˉ5.
ii) x-y5-10=0
Answer :
Linea equation in the form of ax+by+c=0
  5x-y-50=0 
where a=5,b=-1 and c=-50.
iii)-2x+3y=6
Answer :
Linea equation in the form of ax+by+c=0
  -2x+3y-6=0 
where a=-2,b=+3 and c=-6. 
iv)  x=3y
Answer :
Linea equation in the form of ax+by+c=0
  x-3y=0 
where a=1,b=-3 and c=0.
v)  2x=-5y  
 Answer :
Linea equation in the form of ax+by+c=0
  2x+5y=0 
where a=2,b=5 and c=0.
vi)3x+2=0  
Answer :
Linea equation in the form of ax+by+c=0
  3x+2=0 
where a=3,b=0 and c=2.
vii) y-2=0   
Answer :
Linea equation in the form of ax+by+c=0
  y-2=0 
where a=0,b=1 and c=-2.
viii)  5=2x
Answer :
Linea equation in the form of ax+by+c=0
  2x-5=0 
where a=2,b=0 and c=-5.

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