33.
If 6x + 7y = 2004 and 7x + y = 4002, then x + y = equals
यदि 6x +7y = 2004 और 7x + 6y = 4002, तब x + y का मान होगा -
(A) 400
(B) 462
(C) 487
(D) 770
Answers
Answered by
5
{6x+7y=2004........(I)}×7
{7x+6y=4002.......(II)}×6
multiplying eq(I) by 7 and eq(II) by 6,,
on substracting them,,
42x+49y=14028
_42x+_36y=_24012
________________
13y=9984
y=9984/13
y=768
now,,,the value of y putting on eq(I),
then,,
Hence,, the value of,
x+y=-562+768
=206
Hope it helps you...
Answered by
1
Given, ....(1)and
...(2)
Subtracting (1) from (2)
Similarly, ...(1) and ...(2)
Adding (1) and (2)
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