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) |