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If 2x y = 10 and x/y = 3, then x =
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20 Nov 2017, 11:09
20 Nov 2017, 11:09
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Question Stats:
96% (00:46) correct
4% (00:55) wrong based on 50 sessions
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If \(2x − y = 10\) and \(\frac{x}{y}=3\), then x=
A. −10
B. 2
C. 4
D. 6
E. 12
Kudos for correct solution.
A. −10
B. 2
C. 4
D. 6
E. 12
Kudos for correct solution.
Re: If 2x y = 10 and x/y = 3, then x =
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06 Nov 2018, 04:37
06 Nov 2018, 04:37
Expert Reply
If \(2x − y = 10\) and \(\frac{x}{y}=3\), then x=
A. − 10
B. 2
C. 4
D. 6
E. 12
A. − 10
B. 2
C. 4
D. 6
E. 12
Re: If 2x y = 10 and x/y = 3, then x =
[#permalink]
12 Nov 2018, 02:21
12 Nov 2018, 02:21
from the eqn x = 3y
the other given eqn is 2x-y = 10
make the base of y same i.e 6x-3y=30
this eqn boils down to we have, 6x-30 = 3y
therefore we can equate the two eqn x=6x-30
or, 30 =5x
x = 6
the other given eqn is 2x-y = 10
make the base of y same i.e 6x-3y=30
this eqn boils down to we have, 6x-30 = 3y
therefore we can equate the two eqn x=6x-30
or, 30 =5x
x = 6
