8th Maths : Chapter 3 : Algebra : Graph : Exercise 3.8 : Text Book Back Exercises Questions with Answers, Solution

**Exercise
3.8**

**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]**

** **

**2. Say True or False:**

(i) (−10,20)
lies in the second quadrant. **[Answer: True]**

**Solution:**

(−10, 20)

*x* = − 10, *y* = 20

∴ (− 10, 20) lies in
second quadrant – True

(ii) (−9,
0) lies on the *x*-axis. **[Answer: True]**

**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). **[Answer: False]**

**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 __(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)__

** **

**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**

** **

Tags : Questions with Answers, Solution | Algebra | Chapter 3 | 8th Maths , 8th Maths : Chapter 3 : Algebra

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8th Maths : Chapter 3 : Algebra : Exercise 3.8 (Graph Basics) | Questions with Answers, Solution | Algebra | Chapter 3 | 8th Maths

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