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If yz – zx = 3 and zx – xy = 4, then xy – yz =
[#permalink]
05 Apr 2019, 00:10
05 Apr 2019, 00:10
Expert Reply
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Question Stats:
77% (01:09) correct
22% (01:19) wrong based on 9 sessions
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If yz – zx = 3 and zx – xy = 4, then xy – yz =
(A) –7
(B) 1
(C) 3
(D) 4
(E) 7
(A) –7
(B) 1
(C) 3
(D) 4
(E) 7
Re: If yz – zx = 3 and zx – xy = 4, then xy – yz =
[#permalink]
06 Apr 2019, 07:41
06 Apr 2019, 07:41
1
add the two expression:
\(i) yz - zx = 3\) and
\(ii) xz - xy = 4\)
both the expression have xz in common that cancels out leaving
\(yz -xy = 7\)
rearranging the eqn we get,
or, \(-7 = xy - yz\)
option A
\(i) yz - zx = 3\) and
\(ii) xz - xy = 4\)
both the expression have xz in common that cancels out leaving
\(yz -xy = 7\)
rearranging the eqn we get,
or, \(-7 = xy - yz\)
option A
gmatclubot
Re: If yz – zx = 3 and zx – xy = 4, then xy – yz = [#permalink]
06 Apr 2019, 07:41
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