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Question 2:

The first equation is,
2x +5y = 14

And the second one as,
2x+2y = 5

Subtracting 2st equation from 1st,


2x+5y -2x -2y = 14 -5

3y = 9

Dividing bith sides by 3,

y =3.

Substitute this value in 1st equation,

2x + 6 = 5

subtracting 6 from both sides,

2x = -1

Dividing both sides by 2,

x =-1/2


So the solutions are (-1/2,3)
Therefore tge correct option is B



Question 17:

True.


Question 19:

Option (B)
Because coal is the decomposed remains of terrestrial flora and fauna.


Question

Option(B) He had proves.

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