Miscellaneous Company Exam
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if 9x-3y = 12 and 3x-5y = 7 then what is 6x-2y = ?
[A] 5
[b] 8(correct)
[c] 11/4
[d] -2
[e] none
Read Solution (Total 6)
-
- [A] 5
9x-3y=12......(1)
3x-5y=7.......(2)
By
(1)-3*(2)
solving
y=-3/4 & x=7/12
put x& y value in eq
6x-2y=5 - 12 years agoHelpfull: Yes(2) No(4)
- Given:9x-3y=12 => 3(3x-y)=12 => (3x-y)=4 ---(1)
To find: 6x-2y=2(3x-y)=2*4 (from eq 1)
=8 so is the answer. - 11 years agoHelpfull: Yes(2) No(0)
- ans:b) 8
sol:
9x-3y=12 subtract by 3x-5y=7
then 6x+2y=5
and 9x-3y=12 => 3x-y=4
which is added to 3x-5y=7
then 6x-6y=11
now this is added to 6x+2y=5
therefore 12x-8y=16 => 6x-4y=8
- 12 years agoHelpfull: Yes(1) No(3)
- ans is 8
9x-3y=12
3(3x-y)=12
3x-y=4
therefore 6x-2y=2(3x-y)=2*4=8; - 11 years agoHelpfull: Yes(1) No(0)
- ans:b) 8
sol:
9x-3y=12 subtract by 3x-5y=7
then 6x+2y=5
and 9x-3y=12 => 3x-y=4
which is added to 3x-5y=7
then 6x-6y=11
now this is added to 6x+2y=5
therefore 12x-4y=16 => 6x-2y=8 - 12 years agoHelpfull: Yes(0) No(1)
- any other method to solve this problem?
- 12 years agoHelpfull: Yes(0) No(0)
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