If $x - 3y = - 20,$ then $2x - 6y =$ - The Beat The GMAT Forum

If $x - 3y = - 20,$ then $2x - 6y =$

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pmFollowed by: 5 members; Thanked: 6 times

by Vincen » Tue Sep 08, 2020 7:36 am

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If $x - 3y = - 20,$ then $2x - 6y =$

(A) - 40
(B) - 10
(C) 0
(D) 10
(E) 40

Answer: A

Source: GMAT Paper Tests

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Source: Beat The GMAT — Problem Solving | Tue Sep 08, 2020 7:36 am

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Scott@TargetTestPrep: GMAT Instructor; Posts: 8154; Joined: Sat Apr 25, 2015 10:56 amFollowed by: 29 members; Location: Los Angeles, CA; Thanked: 43 times

Re: If $x - 3y = - 20,$ then $2x - 6y =$

by Scott@TargetTestPrep » Fri Sep 11, 2020 1:13 pm

Vincen wrote: ↑
Tue Sep 08, 2020 7:36 am
If $x - 3y = - 20,$ then $2x - 6y =$

(A) - 40
(B) - 10
(C) 0
(D) 10
(E) 40

Answer: A

Solution:

Multiplying the given equation by 2, we have:

2x - 6y = -40

Answer: A

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