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Q.

If 10x + 14y = 25 and -14y + 5x = 30 are pair of linear equations in two variables then, adding these two will eliminate

A. variable y

B. variable x

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a

variable y

b

variable x

c

both A & B are incorrect

d

both A & B are correct

answer is A.

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Detailed Solution

detailed_solution_thumbnail

10x + 14y = 25 ---- (1)

-14y + 5x = 30

5x - 14y = 30 ---- (2)

In both the equations co-effiecient of y are opposite and adding the equations will eliminate variable y.

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