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# Does ay = –5 – by? (1) a = b (2) a + b = y

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Math Expert
Joined: 02 Sep 2009
Posts: 54436
Does ay = –5 – by? (1) a = b (2) a + b = y  [#permalink]

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05 Sep 2017, 23:26
00:00

Difficulty:

55% (hard)

Question Stats:

52% (01:19) correct 48% (01:40) wrong based on 35 sessions

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Does ay = –5 – by?

(1) a = b
(2) a + b = y

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Joined: 18 Aug 2016
Posts: 619
Concentration: Strategy, Technology
GMAT 1: 630 Q47 V29
GMAT 2: 740 Q51 V38
Does ay = –5 – by? (1) a = b (2) a + b = y  [#permalink]

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Updated on: 06 Sep 2017, 05:40
Bunuel wrote:
Does ay = –5 – by?

(1) a = b
(2) a + b = y

Does ay + by = -5

(1) a = b but no information abt y
not sufficient

(2) a+b = y
ay + by
y^2..only positive value and hence cannot equal -5
sufficient
B
on combining no values of a, b, y given
PS: Second attempt
B
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Luckisnoexcuse

Originally posted by Luckisnoexcuse on 06 Sep 2017, 00:38.
Last edited by Luckisnoexcuse on 06 Sep 2017, 05:40, edited 1 time in total.
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Joined: 23 Oct 2016
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Re: Does ay = –5 – by? (1) a = b (2) a + b = y  [#permalink]

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06 Sep 2017, 05:18
Luckisnoexcuse wrote:
Bunuel wrote:
Does ay = –5 – by?

(1) a = b
(2) a + b = y

Does ay + by = -5

(1) a = b but no information abt y
not sufficient

(2) a+b = y
ay + by
y^2
no information abt y..not sufficient on combining no values of a, b, y given

E

Y^2 will always be positive and cant be equal to -5.
Current Student
Joined: 18 Aug 2016
Posts: 619
Concentration: Strategy, Technology
GMAT 1: 630 Q47 V29
GMAT 2: 740 Q51 V38
Re: Does ay = –5 – by? (1) a = b (2) a + b = y  [#permalink]

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06 Sep 2017, 05:21
Deepak0311 wrote:
Luckisnoexcuse wrote:
Bunuel wrote:
Does ay = –5 – by?

(1) a = b
(2) a + b = y

Does ay + by = -5

(1) a = b but no information abt y
not sufficient

(2) a+b = y
ay + by
y^2
no information abt y..not sufficient on combining no values of a, b, y given

E

Y^2 will always be positive and cant be equal to -5.

Ha Ha...that'a another way to look at it
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Re: Does ay = –5 – by? (1) a = b (2) a + b = y  [#permalink]

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06 Sep 2017, 05:32
Bunuel wrote:
Does ay = –5 – by?

(1) a = b
(2) a + b = y

Rephrase question
Is ay+by=-5
Is y(a+b)= -5

St:1 No info about y. So NS
St :2 a+b=y, (multiplying Y both side)
y(a+b)=y^2
From above y(a+b) cant be negative.
So answer is confirmed No. Hence sufficient.
B
Luckisnoexcuse wrote:
Deepak0311 wrote:
Luckisnoexcuse wrote:
[quote="Bunuel"]Does ay = –5 – by?

(1) a = b
(2) a + b = y

Does ay + by = -5

(1) a = b but no information abt y
not sufficient

(2) a+b = y
ay + by
y^2
no information abt y..not sufficient on combining no values of a, b, y given

E

Y^2 will always be positive and cant be equal to -5.

Ha Ha...that'a another way to look at it [/quote]

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Re: Does ay = –5 – by? (1) a = b (2) a + b = y   [#permalink] 06 Sep 2017, 05:32
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