Class 8 Ch- 13 Assignment 2

 Class 8 Ch- 13 Assignment 2

1. Use the method of substitution to solve each other of the pair of simultaneous equations: 


 (a) x + y = 15            x - y = 3

 (b) x + y = 0             x - y = 2

 (c) 2x - y = 3            4x + y = 3

 (d) 2x - 9y = 9       5x + 2y = 27


2. Solve each other pair of equation given below using elimination method:


 (a) x + 2y = -4             3x - 5y = -1

 (b) 4x + 9y = 5            -5x + 3y = 8

 (c) 9x - 6y = 12            4x + 6y = 14

 (d) 2y - (3/x) = 12              5y + (7/x) = 1


Answers:

1. (a) x = 9, y = 6

(b) x = 1, y = -1

(c) x = 1, y = -1

(d) x = 261/49, y = 9/49


2. (a) x = -2, y = -1

(b) x = -1, y = 1

(c) x = 2, y = 1

(d) x = -1/2, y = 3

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