If xy + z = x(y + z), which of the following must be true?

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BTGModeratorVI: Legendary Member; Posts: 1223; Joined: Sat Feb 15, 2020 2:23 pm; Followed by:1 members

If xy + z = x(y + z), which of the following must be true?

by BTGModeratorVI » Thu Dec 03, 2020 2:48 pm

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If xy + z = x(y + z), which of the following must be true?

A. x=0 and y=0
B. x=1 and y=1
C. y=1 and z=0
D. x=1 or y=0
E. x=1 or z=0

Answer: E
Source: Official guide

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Source: Beat The GMAT — Problem Solving | Thu Dec 03, 2020 2:48 pm

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8086; Joined: Sat Apr 25, 2015 10:56 am; Location: Los Angeles, CA; Thanked: 43 times; Followed by:29 members

Re: If xy + z = x(y + z), which of the following must be true?

by Scott@TargetTestPrep » Sun Dec 06, 2020 8:58 am

BTGModeratorVI wrote: ↑
Thu Dec 03, 2020 2:48 pm
If xy + z = x(y + z), which of the following must be true?

A. x=0 and y=0
B. x=1 and y=1
C. y=1 and z=0
D. x=1 or y=0
E. x=1 or z=0

Answer: E
Source: Official guide