BTGmoderatorDC wrote:If x is positive, what is the value of y ?
(1) 5x = 15
(2) xy + y = 18
OA C
Source: GMAT Prep
Let's take each statement one by one.
(1) 5x = 15
=> x = 3. We don't have any information about y. Insufficient.
(2) xy + y = 18
=> y(1 + x ) = 18
Many possible values of y, keeping x positive. Insufficient.
(1) and (2)
Plugging in x = 3 in y (1 + x ) = 18, we get y(1 + 3 ) = 18 => y = 18/4 = 9/2. Sufficient.
The correct answer:
C
Hope this helps!
-Jay
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