Tamilnadu State Board New Syllabus Samacheer Kalvi 8th Maths Guide Pdf Chapter 3 Algebra Ex 3.8 Text Book Back Questions and Answers, Notes.
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:
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.
| 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) |