# NCERT Solution for Linear equation Chapter 4 Exercise 4.4

In this page we have NCERT book Solutions for Class 9th Maths Linear equations in two variables for EXERCISE 4.4 on page 77. Hope you like them and do not forget to like , social share and comment at the end of the page.
Question 1
Give the geometric representations of y = 3 as an equation
(i) in one variable
(ii) in two variables
Solution
(i) The representation of the y=3 on the number line is shown in below figure where y=3 is treated as an equation in one variable

(ii) This can be treated as equation in two variable as
$0 \times x + y =3$
Drawing the graph by putting x=0 and x=1

So ,it is a line parallel to X-axis

Question 2
Give the geometric representations of 2x + 9 = 0 as an equation
(i) in one variable
(ii) in two variables
Solution
(i) The representation of the $2x+9=0$ on the number line is shown in below figure where x=-9/2 =4.5 is treated as an equation in one variable

(ii) This can be treated as equation in two variable as
$2x + 0 \times y +9=0$
Drawing the graph by putting y=0 and y=2

So ,it is a line parallel to Y-axis

Reference Books for class 9 Math

Given below are the links of some of the reference books for class 9 Math.

1. Mathematics for Class 9 by R D Sharma One of the best book for studying class 9 level mathematics. It has lot of problems to be solved.
2. Secondary School Mathematics for Class 9 by R S Aggarwal This is also as good as R.D. Sharma. Either this or the book by R.D. Sharma will do. I find book R.S. Aggarwal little bit more challenging than the one by R.D. Sharma.
3. Pearson IIT Foundation Series - Maths - Class 9 Buy this book if you want to challenge yourself further and want to prepare for JEE foundation.
4. Pearson IIT Foundation Physics, Chemistry & Maths combo for Class 9 Only buy if you are prepared to study extra topics and want to take your studies a step further. You might need help to understand topics in these books.

You can use above books for extra knowledge and practicing different questions.

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