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.
