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27 Nov 2019, 23:32
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B
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Difficulty:
5%
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Question Stats:
88% (01:01) correct
12%
(01:22)
wrong
based on 130
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If 3x – 2y = 7, what is the value of x ?
1) x and y are positive integers.
2) x = y − 1
1) x and y are positive integers.
2) x = y − 1
28 Nov 2019, 11:24
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If 3x – 2y = 7, what is the value of x ?
1) x and y are positive integers.
3x= 7 +2y
x = 1/3(7+2y)
y = 1 --> x=1/3(9) x=3
y = 4 --> x=1/3(15) x= 5
y = 10 --> x=1/3(27) x=9
Not Sufficient
2) x = y − 1
3(y-1) – 2y = 7
3y-3 -2y =7
y=10
for y =10 x =9 Sufficient
Ans B
1) x and y are positive integers.
3x= 7 +2y
x = 1/3(7+2y)
y = 1 --> x=1/3(9) x=3
y = 4 --> x=1/3(15) x= 5
y = 10 --> x=1/3(27) x=9
Not Sufficient
2) x = y − 1
3(y-1) – 2y = 7
3y-3 -2y =7
y=10
for y =10 x =9 Sufficient
Ans B
29 Nov 2019, 12:40
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CAMANISHPARMAR
Statement 1:
The statement is not constricting enough, we have many combinations of x and y that can solve this. x = 3 and y = 1, or x = 5 and y = 4. Insufficient.
Statement 2:
We have two equations with two variables that are linear and independent. That allows us to solve for a unique solution so this is sufficient.
Ans: B
