CLASS 9 MATH NCERT SOLUTION FOR CHAPTER – 3 COORDINATE GEOMETRY EX – 3.3

Coordinate Geometry

Question 1
In which quadrant or on which axis do each of the points (-2, 4),(3, -1), (-1, 0),(1, 2) and (-3, -5) lie? Verify your answer by locating them on the Cartesian plane.

Solution:
The point (-2, 4) is having negative abscissa and positive ordinate.
∴ (-2,4) lies in the 2nd quadrant.

The point (3, -1) is having positive abscissa and negative ordinate.
∴ (3, -1) lies in the 4th quadrant.

The point (-1, 0) is having negative abscissa and zero ordinate.
∴ The point (-1, 0) lies on the negative x-axis.

The point (1, 2) is having the abscissa as well as ordinate positive.
∴ Point (1,2) lies in the 1st quadrant.

The point (-3, -5) is having the abscissa as well as ordinate negative.
∴ Point (-3, -5) lies in the 3rd quadrant.

These points are plotted in the Cartesian plane as shown in the following figure as A(-2, 4); B(3, -1); C(-l, 0); D(l, 2) and E (-3, -5).

NCERT Solutions for Class 9 Maths Chapter 3 Coordinate Geometry Ex 3.3 Q1

Question 2
Plot the points (x, y) given in the following table on the plane, choosing suitable units of distance on the axes.

NCERT Solutions for Class 9 Maths Chapter 3 Coordinate Geometry Ex 3.3 Q2

Solution:
The given points are (-2, 8), (-1, 7), (0, -1.25), (1,3) and (3, -1).
To plot these points:

(i) We draw X’OX and YOY’ as axes.

(ii) We choose suitable units of distance on the axes.

(iii) To plot (-2,8), we start from O, take (-2) units on x-axis and then (+8) units on y – axis. We mark the point as A (-2, 8).

(iv) To plot (-1,7), we start from O, take (-1) units on x-axis and then (+7) units on the y – axis. We mark the point as B(-1, 7).

(v) To plot (0, -1.25), we move along 1.25 units below the x-axis on the y – axis and mark the point as C(0, -1.25).

(vi) To plot (1, 3), we take (+1) unit on the x-axis and then (+3) units on the y – axis. We mark the point as D(1, 3).

(vii) To plot (3, -1), we take (+3) units on the x-axis and then (-1) unit on the y – axis. We mark the point E(3, -1).

NCERT Solutions for Class 9 Maths Chapter 3 Coordinate Geometry Ex 3.3 Q2.1