Exercise
3.8
Fill in the blanks:
(i) X- axis
and Y-axis intersect at __________.
(ii) The
coordinates of the point in third quadrant are always__________.
(iii) (0,
−5) point lies on ________axis.
(iv) The
x- coordinate is always ______on the y-axis.
(v) _________
coordinates are the same for a line parallel to Y-axis.
2. Say True or False:
(i) (−10,20)
lies in the second quadrant.
Solution:
(−10, 20)
x = − 10, y = 20
∴ (− 10, 20) lies in
second quadrant – True
(ii) (−9,
0) lies on the x-axis.
Solution:
(−9, 0) on x − axis,
Y− coordinate is always zero.
∴ (−9, 0) lies on x
axis – True
(iii) The
coordinates of the origin are (1,1).
Solution:
Coordinate of origin is (0, 0), not (1, 1). Hence – False
3. Find the quadrants without plotting
the points on a graph sheet.
(3, -4), (5,7), (2,0), ( -3, -5), (4,
-3), ( -7,2), ( -8,0), (0,10), ( -9,50).
Solution:
If x & y coordinate are positive −1 quad
If x is positive, y is negative − IV quad
If x is negative, y is positive − II quad
If both are negative, then − III quad
4. Plot the following points in a graph
sheet.
A(5,2),
B( -7, -3), C( -2,4), D( -1, -1), E(0, -5), F(2,0), G(7, -4), H( -4,0), I(2,3),
J(8, -4), K(0,7).
Solution:
5. Use the
graph to determine the coordinates where each figure is located.
a) Star
b) Bird
c) Red Circle
d) Diamond
e) Triangle
f) Ant
g) Mango
h) Housefly
i) Medal
j) Spider
Exercise 3.8
1. (i) Origin (0,0)
(ii) negative (iii) y-axis (iv) zero (v)
x-Coordinate
2. (i) True (ii) True (iii) False
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