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10 Dec 2018, 16:51
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
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Question Stats:
87% (02:25) correct
13%
(03:05)
wrong
based on 539
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If \(x + y = 24\) and \(2x-7y=15\), which of the following is equal to 13?
A. \(x-y\)
B. \(x+y\)
C. \(x-2y\)
D. \(2x + y\)
E. \(2x-y\)
A. \(x-y\)
B. \(x+y\)
C. \(x-2y\)
D. \(2x + y\)
E. \(2x-y\)
General Discussion
10 Dec 2018, 19:17
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Derive Y value via elimination.
-2x-2y=-48
2x−7y=15
Y=11/3 then X = 24-11/3
No need for exact X value, skim the answers to see choice C equals 13. x−2y = (24-11/3)-2*(11/3) = 13
-2x-2y=-48
2x−7y=15
Y=11/3 then X = 24-11/3
No need for exact X value, skim the answers to see choice C equals 13. x−2y = (24-11/3)-2*(11/3) = 13
