Exercise 3.8 - Chapter 3 Algebra 8th Maths Guide Samacheer Kalvi Solutions - SaraNextGen [2024-2025]

Updated By SaraNextGen

On April 24, 2024, 11:35 AM

Ex $3.8$
Question 1.
Fill in the blanks:
(i) $\mathrm{X}$ - 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 $\mathrm{Y}$-axis.
Answer:
$\mathrm{X}$

Question $2 .$
Say True or False:
(i) $(-10,20)$ lies in the second quadrant.
Answer:
True
Hint:
$(-10,20)$

$\mathrm{x}=-10, \mathrm{y}=20$
$\therefore(-10,20)$ lies in second quadrant - True
(ii) $(-9,0)$ lies on the $x$-axis.
Answer:
True
Hint:
$(-9,0)$ on $\mathrm{x}$ - axis. Y- coordinate is always zero.
$\therefore(-9,0)$ lies on $\mathrm{x}$ 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:
$(3,-4),(5,7),(2,0),(-3,-5),(4,-3),(-7,2),(-8,0),(0,10),(-9,50)$

If $\mathrm{X}$ \& $\mathrm{y}$ 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.
$\mathrm{A}(5,2), \mathrm{B}(-7,-3), \mathrm{C}(-2,4), \mathrm{D}(-1,-1), \mathrm{E}(0,-5), \mathrm{F}(2,0), \mathrm{G}(7,-4), \mathrm{H}(-4,0), \mathrm{I}(2,3), \mathrm{J}(8$ $-4), \mathrm{K}(0,7)$.

Answer:

Question 5.

Use the graph to determine the coordinates where each figure is located

Answer: