1 A 1 B 2 3 4 A 4 B 4 C 4 D 4 E 4 F 4 G 4 H 4 I 4 J 4 K 4 L 4 M 4 N 4 O 4 P

West Bengal Mathematics

5. Linear Simultaneous Equations

1. Real Numbers
2. Laws of Indices
3. Graph
4. Co-ordinate Geometry: Distance Formula
5. Linear Simultaneous Equations
6. Properties of Parallelogram
7. Polynomial
8. Factorisation
9. Transversal and Mid-Point Theorem
10. Profit and Loss
11. Statistics
12. Theorems on Area
13. Construction: (Construction of a Parallelogram whose measurement of one angle is given and equal in area of a triangle)
14. Construction: (Construction of a triangle equal in area of a quadrilateral)
15. Area and Perimeter of Triangle and Quadrilateral Shaped Region
16. Circumference of Circle
17. Theorems on concurrence
18. Area of Circular Region
19. Co-ordinate Geometry: Internal and External Division of Straight Line Segment
20. Co-ordinate Geometry: Area of Triangular Region
21. Logarithm

Let us Work Out 5.1

Let us Work Out 5.2

1 A 1 B 1 C 1 D 2 A 2 B 2 C 2 D 3 A 3 B 3 C 3 D 4 A 4 B 4 C 4 D 4 E 4 F 5 A 5 B 5 C

Let us Work Out 5.3

1 A 1 B 2 3 4 A 4 B 4 C 4 D 4 E 4 F 4 G 4 H 4 I 4 J 4 K 4 L 4 M 4 N 4 O 4 P

Let us Work Out 5.4

1 2 3 A 3 B 3 C 3 D 4 5 A 5 B 5 C 5 D 5 E 5 F 5 G 5 H 5 I 5 J 5 K 5 L

Let us Work Out 5.5

1 2 3 A 3 B 4 A 4 B 4 C 4 D 5 A 5 B 5 C 5 D 5 E 5 F 5 G 5 H

Let us Work Out 5.6

1 2 3 4 5 6 7 8 9 10 11 12 13

Q. 2

To eliminate y, w

Class 9th West Bengal Mathematics 5. Linear Simultaneous Equations

Answer :

To eliminate y, we have to make the coefficient of y in both the equations equal, so we have to multiply the coefficient of y with such a number that makes them equal to the common multiple of both of them.

In this case, equation 7x – 5y + 2 = 0 should be multiplied by 3 such that the coefficient of y will be equal to 15 in both the cases.

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