S.chand Class 8 Maths Solution Chapter 21 Graphs Exercise 21 A

 Exercise 21 A

Question 1

1. Plot the following points using the same pair of axes and the same scale for each one.

(i) $(0,18)$

(ii) $(5,8)$

(iii) $(7,0)$

(iv) $(5,-8)$

(v) $(8,-14)$

(vi) $(-15,4)$

(vii) $(-9,5)$

(viii) $(-8,-15)$

(ix) $(-12,-7)$

(x) $(-8,0)$

2. Given the following ordered pairs of numbers, write the number of the quadrant in which you find the point represented by each of these ordered pairs.

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Ordered Pair   Quadramt

(a) $(2,4)$

(b) $(3,-5)$

(c) $(-1,6)$

(d) $(-4,-4)$

(e) $(7,-2)$

(f) $(-5,-3)$

(g) $(6,1)$

(h) $(-3,5)$

3. Look at the map of the Zoo. What can be found at :

(a) $(8,2)$

(b) $(5,0)$

(c) $(8,9)$

(d) $(4,5)$

(e) $(4,2)$

(f) $(1,2) ?$

4. What are the coordinates of :

(a) the exit

(b) the camels

(c) the elephants

(d) the monkeys

(e) the penguins ?

5. In which quadrant does the point lie if

(a) both numbers of the ordered pair are positive?

(b) both numbers of the ordered pair are negative ?

(c) the $x$-coordinate of an ordered pair is negative and the $y$-coordinate is positive ?

(d) the $x$-coordinate of an ordered pair is positive and the $y$-coordinate is negative?

6. The radar screen shows aircraft positions. Write down the coordinates of the aircraft in various positions $A, B, C, D, E, F$ and $G$.

7. In which quadrant or on which axis will (x, y) be graphed if :

(a) $x>0$ and $y>0$ ?

(b) $x<0$ and $y<0$ ?

(c) $x>0$ and $y<0$ ?

(d) $x<0$ and $y>0$ ?