Page 339 - Start Up Mathematics_8 (Non CCE)

Example 9: Plot the following points on a graph
paper: Y
(a) A(–4, 2) (b) B(2, 5)
6
(c) C(0, 3) (d) D(–2, –1) 5 B(2,5)
4
(e) E(–3, 0) (f) F(1, –2) C(0,3)
A(–4,2) 3
Solution: (a) Take a graph paper and draw 2
the X-axis and the Y-axis. E(–3,0) 1
X’ X
(b) Mark the origin 0. –5 –4 –3 –2 –1 –1 0 1 2 3 4 5
(c) Using a proper scale, mark D(–2,–1) –2 F(1,–2)
numbers on X- and Y-axis. –3
(d) Plot the above points keeping
in mind the quadrant in which Y’
it lies.

Example 10: Write the coordinates of the vertices in
the following figure: Y
Solution: Draw perpendiculars from points J, K, L, 10
M and N on the X-axis and the Y-axis.
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Now, AJ = 2, JB = 5 8
fi Coordinates of J are (2, 5) 7 G N

Similarly, KC = 1, KD = 1 6 A J
5 M
fi Coordinates of K are (1, 1) 4

LC = 10, LE = 1 3
2
fi Coordinates of L are (10, 1) K
1 C L
AM = 9, MF = 5 X’ D B H F E X
0 1 2 3 4 5 6 7 8 9 10
fi Coordinates of M are (9, 5)
GN = 5, NH = 7 Y’

fi Coordinates of N are (5, 7)

EXERCISE 21.3

1. Write the quadrants in which the following points lie:
(a) (–4, 7) (b) (3, 5) (c) (1, –2) (d) (–3, –3)
(e) (8, 10) (f) (6, –8)

2. Plot the following points on a graph:
(a) (0, 3) (b) (2, –3) (c) (–1, 4) (d) (2, 0)

(e) (4, –5) (f) (4, 8) (g) (–3, 0) (h) (–2, –3)

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