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If -5x+2y=9 and 3x-4y=-4, then what is the value of
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26 Apr 2021, 12:40
26 Apr 2021, 12:40
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Question Stats:
69% (02:11) correct
30% (02:15) wrong based on 26 sessions
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If \(-5x+2y=9\) and \(3x-4y=-4\), then what is the value of \(7x+10y\)?
A. -19
B. -17
C. -9
D. 9
E. 19
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
A. -19
B. -17
C. -9
D. 9
E. 19
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Re: If -5x+2y=9 and 3x-4y=-4, then what is the value of
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27 Apr 2021, 05:54
27 Apr 2021, 05:54
1
Multiplying 1st equation by 3 and 2nd equation by 5, we will get
-15x+6y=27
15x-20y=-20
adding both
y=-1/2, then 10y = -5
Adding the value of y in 1st equation
x = -2, then 7x = -14
7x+10y = -14-5 = -19.
Hence A
-15x+6y=27
15x-20y=-20
adding both
y=-1/2, then 10y = -5
Adding the value of y in 1st equation
x = -2, then 7x = -14
7x+10y = -14-5 = -19.
Hence A
Re: If -5x+2y=9 and 3x-4y=-4, then what is the value of
[#permalink]
28 Apr 2021, 05:18
28 Apr 2021, 05:18
x=-2
y=-1/2
Answer - A
y=-1/2
Answer - A
