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✧ CLASS -9 -MATHS- CHAPTER 3- COORDINATE GEOMETRY

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Answer 1

Answer:

1. (-2,4) lies in 2nd quadrant

   (3,-1) lies in 4th quadrant

   (-1,0) lies in 2nd quadrant

   (1,2) lies in 1st quadrant

    (-3,-5) lies in 3rd quadrant

2. Plot the graph.

Answer 2

Step-by-step explanation:

Solutions :-

1)

Given points are :-

(-2,4) lie in 2nd Quadrant

Since (-,+) in Q2

(3,-1) lie in 4th Quadrant

Since (+,-) in Q4

(-1,0) lies on X-axis

Since the coordinate of y = 0

(1,2) lies in 1st Quadrant

Since (+,+) in Q1

(-3,-5) lie in 3rd Quadrant

Since (-,-) in Q3

Scale :-

On x-axis 1 cm = 1 unit

On y-axis 1 cm = 1 unit

2) Given points are :

(-2,8) lies in Q2

Since (-,+) in Q2

(-1,7) lies in Q2

Since (-,+) in Q2

(0,-1.25) lies in Q4

Since (+,-) in Q4

(1,3) lies in Q 1

Since (+,+) in Q1

(3,-1) lies in Q4

Since (+,-) in Q4

Scale :-

On x-axis 1 cm = 0.5 units

On y-axis 1 cm = 1 unit

• Horizontal line is called X-axis

• Vertical line is called Y-axis.

• The equation of X-axis = y=0

• The equation of Y-axis = x=0

• The intersection of X and Y-axes is the Origin O(0,0)

• If (x>0,y>0) the point lies in Q1
• if(x<0,y>0) the point lies in Q2
• If (x<0,y<0) the point lies in Q3
• If (x>0,y<0) the point lies in Q4
• Rene Descartes was the father of Coordinate Geometry