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# If a = x – b and b = a – y, what is the value of ab ?

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If a = x – b and b = a – y, what is the value of ab ? [#permalink]

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16 Apr 2017, 12:01
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86% (01:31) correct 14% (02:02) wrong based on 7 sessions

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If a = x – b and b = a – y, what is the value of ab ?

A. $$\frac{(x^2 + y^2)}{4}$$
B. $$\frac{xy}{4}$$
C. $$\frac{(x-y)}{4}$$
D. $$\frac{(x^2 - y^2)}{4}$$
E. $$\frac{(y^2 - x^2)}{4}$$
[Reveal] Spoiler: OA

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Re: If a = x – b and b = a – y, what is the value of ab ? [#permalink]

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16 Apr 2017, 12:04
If a = x – b and b = a – y, what is the value of ab ?

A. $$\frac{(x^2 + y^2)}{4}$$
B. $$\frac{xy}{4}$$
C. $$\frac{(x-y)}{4}$$
D. $$\frac{(x^2 - y^2)}{4}$$
E. $$\frac{(y^2 - x^2)}{4}$$

Here it is: https://gmatclub.com/forum/if-a-b-x-and ... 34848.html
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Re: If a = x – b and b = a – y, what is the value of ab ?   [#permalink] 16 Apr 2017, 12:04
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# If a = x – b and b = a – y, what is the value of ab ?

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