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Ex.4.4 Q1 Linear Equations in Two Variables Solution - NCERT Maths Class 9

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Question

Give the geometric representation of \(y = 3\) as an equation

(i) in one variable

(ii) in two variables

 Video Solution
Linear Equations In Two Variables
Ex 4.4 | Question 1

Text Solution

  

Steps:

(i) Given,

Considering \(y = 3\) is the equation in one variable

The representation of the solution on the number when \(y = 3\) is treated as an equation in one variable

In one variable, \(y = 3\) represents a point as shown in following figure.

(ii) Given:

Considering \(y = 3\) is the equation in two variables

We know that \(y = 3\) can be written as \(0.x + y = 0\).

In two variables, \(y = 3\) represents a straight line passing through point \((0, 3)\) and parallel to \(x\)-axis. It is a collection of all the points on the plane, having their \(y\)-coordinate as \(3.\)

Hence,

  • When, \(x = 0\), we get \(y = 3\);
  • When \(x = 2\), we get \(y = 3\);
  • When \(x = -2\), we get \(y = 3\) are the solutions for the equations.

Plotting the points \((0, 3) (2, 3)\) and \((–2, 3)\) and on joining them we get the graph \(AB\) as a line parallel to \(x\)-axis at a distance of \(3\,\rm units\) above it

The graphical representation is shown below:

 Video Solution
Linear Equations In Two Variables
Ex 4.4 | Question 1
  
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