TN 8 Maths

Samacheer Kalvi 8th Maths Guide Chapter 3 Algebra Ex 3.8

Samacheer Kalvi 8th Maths Guide Chapter 3 Algebra Ex 3.8

Tamilnadu Samacheer Kalvi 8th Maths Solutions Chapter 3 Algebra Ex 3.8

Question 1.
Fill in the blanks:
(i) X- axis and Y-axis intersect at _________ .
Answer:
Origin (0,0)

(ii) The coordinates of the point in third quadrant are always _________ .
Answer:
negative

 

(iii) (0, -5) point lies on _________ axis.
Answer:
Y-axis

(iv) The x- coordinate is always ______ on the y-axis.
Answer:
Zero

(v) ___________ coordinates are the same for a line parallel to Y-axis.
Answer:
X

Question 2.
Say True or False:
(i) (-10,20) lies in the second quadrant.
Answer:
True
Hint:
(-10, 20)
x = -10, y = 20
∴ (-10, 20) lies in second quadrant – True

(ii) (-9, 0) lies on the x-axis.
Answer:
True
Hint:
(-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).
Answer:
False
Hint:
Coordinate of origin is (0, 0), not (1, 1). Hence – False

Question 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).
Answer:

amacheer Kalvi 8th Maths Guide Answers Chapter 3 Algebra Ex 3.8 1
If X & y coordinate are positive – I 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

 

Question 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).
Answer:

 

Question 5.
Use the graph to determine the coordinates where each figure is located.
Samacheer Kalvi 8th Maths Guide Answers Chapter 3 Algebra Ex 3.8 4

a) Star ____________
b) Bird ____________
c) Red circle ____________
d) Diamond ____________
e) Triangle ____________
f) Ant ____________
g) Mango ____________
h) Housefly ____________
i) Medal ____________
j) Spider ____________

Answer:

a) Star (3, 2)
b) Bird (-2, 0)
c) Red circle (-2, -2)
d) Diamond (-2, 2)
e) Triangle (-1, 1)
f) Ant (3, -1)
g) Mango (0, 2)
h) Housefly (2, 0)
i) Medal (-3, 3)
j) Spider (0, -2)

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